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HTML 

              
                <div class="yellow">
  <div id="calendar">
    <div id="toolbar"></div>
    <div id="color-picker" class="show"></div>
    <div id="dates" class="show">
      <div id="lastMt">&lsaquo;</div>
      <div id="nextMt">&rsaquo;</div>
      <div id="months-cont">
        <div id="months">
        <span class="active month">January</span><span class="month">February</span><span class="month">March</span><span class="month">April</span><span class="month">May</span><span class="month">June</span><span class="month">July</span><span class="month">August</span><span class="month">September</span><span class="month">October</span><span class="month">November</span><span class="month">December</span>
      </div>
      </div>
      <div id="daysotweek">
        <div class="day">S</div>
        <div class="day">M</div>
        <div class="day">T</div>
        <div class="day">W</div>
        <div class="day">T</div>
        <div class="day">F</div>
        <div class="day">S</div>
      </div>
      <div id="days">
      </div>
    </div>
    <div id="info" class="hide">
      <div id="actual-date"></div>
      <div id="back"><</div>
        <div id="month-name"></div>
        <div id="weather">
          <div id="sun"></div>
          <div id="mountains"></div>
          <div id="rain">
            <div class="raindrop" id="drop-1"></div>
            <div class="raindrop center" id="drop-2"></div>
            <div class="raindrop center" id="drop-3"></div>
            <div class="raindrop" id="drop-4"></div>
          </div>
          <div id="temp">57&deg;<span>F</span></div>
        </div>
        <div id="bg-card">
          <div class="content"></div>
        </div>
      <div id="card">
        <div class="content">
          <div id="event-name"></div>
          <div id="event-details">
          <div class="col-3">
            <i class="fa fa-map-marker" aria-hidden="true"></i>
            <h3>Location</h3>
            <p>12345 Generic Ave., Some City, Some State, 12345
          </div>
          <div class="col-3">
            <i class="fa fa-clock-o" aria-hidden="true"></i>
            <h3>Time</h3>
            <p> 12:00 AM </p>
          </div>
          <div class="col-3">
            <i class="fa fa-user" aria-hidden="true"></i>
            <h3>Attendee</h3>
            <p>Me, You, and 2+</p>
          </div>
            <div style="clear: both"></div>
        </div>
      
        </div>
      </div>
    </div>
    <div id="colors" class="hide">
      <div id="close">&times;</div>
      <p>Choose theme color</p>
      <div class="color" id="salmon"></div>
      <div class="color" id="dkpink"></div>
      <div class="color" id="red"></div>
      <div class="color" id="redorg"></div>
      <div class="color" id="orange"></div>
      <div class="color" id="orgylw"></div>
      <div class="color active" id="yellow"></div>
      <div class="color" id="green"></div>
      <div class="color" id="aqua"></div>
      <div class="color" id="teal"></div>
      <div class="color" id="sltbl"></div>
      <div class="color" id="pwdbl"></div>
      <div class="color" id="blue"></div>
      <div class="color" id="purple"></div>
      <div class="color" id="dkprpl"></div>
    </div>
  </div>
</div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Montserrat:400,700);
$salmon: #FB5965;
$dkpink: #E21C71;
$red: #E21C20;
$redorg: #EF4100;
$orange: #F76500;
$orgylw: #F77900;
$yellow: #FCEE6D;
$green: #8ABE30;
$aqua: #49E7D7;
$teal: #24A69E;
$sltbl: #288ED3;
$pwdbl: #2E73FF;
$blue: #1636E1;
$purple: #953CFE;
$dkprpl: #6100D6;
$gray: #626972;
$dkgray: #29323F;
$lavender: #838ECF;
@mixin hideOrShow($initVal, $finVal){
  @-webkit-keyframes hideOrShow{
    0% {
      display: $initVal
    }
    100% {
      display: $finVal;
    }
  }
  @keyframes hideOrShow{
    0% {
      display: $initVal
    }
    100% {
      display: $finVal;
    }
  }
  &{
    animation: hideOrShow 0.1s linear 2s forwards;
  }
}
@mixin stagger-fadein($i, $timer, $max) {
   @-webkit-keyframes fadeIn {
    0% {
      opacity: 0;
      transform: scale(0);
    }
    100% {
      opacity: 1;
      transform: scale(1);
    }
  }
  @keyframes fadeIn {
    0% {
      opacity: 0;
      transform: scale(0);
    }
    100% {
      opacity: 1;
      transform: scale(1);
    }
  }
  $i: 0;
  $timer: 0.2;
  @while $i < $max {
    &:nth-child(#{$i}){
      animation: fadeIn 0.1s linear #{$timer}s forwards;
    }
    $i: $i + 1;
    $timer: $timer + 0.05;
  }
}
@mixin raindrop($i, $timer) {
  i: 1;
  $timer: 2;
  @keyframes rain {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 1;
    }
  }
  @-webkit-keyframes rain {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 1;
    }
  }
  @while $i < 5 {
    &#drop-#{$i}{
      animation: rain 0.1s linear #{$timer}s forwards;
    }
    $i: $i + 1;
    $timer: $timer + 0.05;
  }
}
@keyframes flipUp {
  0% {
    transform: rotateX(-90deg);
  }
  100% {
    transform: rotateX(0deg);
  }
}
* {
  box-sizing: border-box;
  outline: 0;
}
html, body{
  height: 100%;
  margin: 0;
}
@each $name, $color in (salmon, $salmon), (dkpink, $dkpink), (red, $red), (redorg, $redorg), (orange, $orange), (orgylw, $orgylw), (yellow, $yellow), (green, $green), (aqua, $aqua), (teal, $teal), (sltbl, $sltbl), (pwdbl, $pwdbl), (blue, $blue), (purple, $purple), (dkprpl, $dkprpl) {
  .#{$name}, .prev-.#{$name}{
    font-family: 'Monserrat', sans-serif;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: $color;
    &.#{$name}{
      background: $color;
      transition: all 0.2s ease-in-out;
    }
    #calendar {
      width: 16.5em;
      min-height: 18em;
      padding-bottom: 1.25em;
      height: auto;
      background: $dkgray;
      color: #FFF;
      position: relative;
      box-shadow: 3px 3px 15px 0px rgba($dkgray, 0.75);
      margin-left: 50%;
      margin-top: 5vw;
      transform: translateX(-50%);
      -webkit-user-select: none;
      user-select: none;
      .input {
        a {
          display: block;
          top: 0;
          left: 0;
          position: absolute;
          padding: 1em 1.5em;
          width: 100%;
          background-size: 200% 100%;
          background-image: linear-gradient(to left, $color 50%, transparent 50%);
          transition: background-position .1s ease-in-out;
          &:hover {
            cursor: pointer;
            background-position: 100% 0;
            // color: $color;
          }
        }
      }
      .has-event {
        &:after{
          content: '';
          display: block; 
          position: absolute;
          left: 50%;
          top: 50%;
          border-radius: 50%;
          border: 0.1em solid $color;
          height: 1.4em;
          width: 1.4em;
          margin-left: -0.8em;
          margin-top: -0.8em;
        }
        &.expanded {
          color: $dkgray;
          &:hover {
            color: $dkgray!important;
          }
          &:after{
            background: $color;
            border-radius: 50%;
            z-index: -1;
          }
        }
      }
      #color-picker {
        background: $color;
        width: 0.65em;
        height: 0.65em;
        position: absolute;
        top: 1em;
        left: 1em;
        border-radius: 50%;
        z-index: 10;
        font-weight: 700;
        &:hover {
          cursor: pointer;
        }
      }
      #dates {
        padding: 1em 1.5em 0;
        // position: absolute;
        // top: 0;
        // left: 0;
        position: relative;
        width: 100%;
        #days {
          .day {
            @include stagger-fadein(1, 1, 40);
            opacity: 0;
            &:hover {
              color: $color;
              cursor: pointer;
            }
          }
        }
      }
      #lastMt, #nextMt {
        color: $gray;
        position: absolute;
        top: 1.45em;
        font-weight: 700;
        font-size: 1.25em;
        z-index: 3;
        &:hover {
          cursor: pointer;
        }
      }
      #lastMt {
        left: 3.25em;
      }
      #nextMt {
        right: 3.25em;
      }
      #months-cont {
        width: 50%;
        overflow: hidden;
        height: 3em;
        left: 50%;
        margin-left: -25%;
        position: relative;
        #months {
          height: 100%;
          white-space: nowrap;
          padding-top: 1em;
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          .month {
            width: 100%;
            font-size: 0.75em;
            text-transform: uppercase;
            color: $color;
            display: inline-block;
            text-align: center;
            &:first-child{
              transition: all 0.5s ease-in-out;
            }
          }
        }
      }
      #days, #daysotweek {
        .day {
          width: calc(100%/7);
          text-align: center;
          float: left;
          padding: 0.5em 0;
          font-size: 0.8em;
          position: relative;
          transition:all 0.1s ease-in;
        }
      }
      #daysotweek {
        margin-top: 0.75em;
      }
    }
    #info #actual-date {
      text-align: center;
      float: left;
      padding: 0.5em 0;
      font-size: 0.8em;
      background: $color;
      color: $dkgray;
      height: 1.5em;
      width: 1.5em;
      line-height: .5em;
      text-align: center;
      border-radius: 50%;
      position: absolute;
    }
  }
  #colors {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5em;
    #close {
     color: $gray; 
      position: absolute;
      top: 0.5em;
      right: 1em;
      &:hover {
        cursor: pointer;
      }
    }
    &.show .color {
      border-radius: 50%;
      position: relative;
      float: left;
      opacity: 0;
      width: 14%;
      padding-bottom: 14%;
      margin: 3%;
      &##{$name}{
        @include stagger-fadein(10, 0, 20);
        background: $color;
        transform-origin: center;
      }
      &.active {
        box-shadow: 0 0 0 3px #FFF inset;
      }
      &:hover {
        cursor: pointer;
      }
    }
  }
  #info {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    &.show {
      #card .content{
        animation: flipUp 0.2s linear 0.9s forwards;
      }
      #bg-card .content {
        animation: flipUp 0.2s linear 0.6s forwards;
      }
      #rain .raindrop {
        @include raindrop(1, 1);
      }
    }
    #back {
      color: $gray;
      position: absolute;
      top: 1em;
      left: 1em;
    }
    #weather {
      width: 88%;
      left: 50%;
      margin-left: -44%;
      position: relative;
      top: 2em;
      #sun{
        width: 0.75em;
        height: 0.75em;
        background: $yellow;
        transform: rotate(45deg);
        position: absolute;
        left: 5.8em;
        top: 1.8em;
        &:after {
          content: '';
          display: block;
          width: 0.75em;
          height: 0.75em;
          background: gold;
          position: absolute;
          left: 0;
          transform: rotate(-45deg);
        }
      }
      #rain {
        position: absolute;
        top: 3.8em;
        width: 11%;
        left: 50%;
        margin-left: -18.1%;
        text-align: center;
        .raindrop {
          opacity: 0;
          width: 0.35em;
          height: 0.35em;
          background: lighten($pwdbl, 15%);
          border-radius: 50%;
          position: relative;
          &:before {
            content: '';
            display: block;
            position: absolute;
            top: -0.22em;
            left: 0;
            border-left: 0.2em solid transparent;
            border-right: 0.20em solid transparent;
            border-bottom: 0.35em solid  lighten($pwdbl, 15%);
          }
          &.center {
            top: 0.1em;
          }
          &#drop-1, &#drop-4 {
            clear: both;
            margin-left: 50%;
            transform: translateX(-50%);
          }
          &#drop-2 {
            float: left;
            clear: left;
          }
          &#drop-3 {
            float: right;
            clear: right;
          }
          &#drop-4 {
            top: 0.17em;
          }
        }
      }
      #mountains {
        width: 0;
        height: 0;
        border-left: 1.25em solid transparent;
        border-right: 1.25em solid transparent;
        border-bottom: 1.75em solid lighten($gray, 30%);
        top: 1.5em;
        left: 4em;
        position: relative;
        &:after {
          content: '';
          display: block;
          position: absolute;
          left: 0em;
          width: 0;
          height: 0;
          bottom: -1.75em;
          border-left: 0.75em solid transparent;
          border-right: 0.75em solid transparent;
          border-bottom: 1.15em solid lighten($gray, 45%);
        }
        
      }
      #temp {
        font-size: 1.5em;
        display: inline-block;
        vertical-align: top;
        font-family: 'Montserrat', sans-serif;
        margin-top: 0em;
        margin-left: 4.75em;
        span {
          font-size: 0.65em;
          display: inline-block;
          padding-top: 0.25em;
          vertical-align: top;
        }
      }
    }
    #month-name {
      text-transform: uppercase;
      font-size: 0.7em;
      position: absolute;
      top: 1em;
      right: 3em;
    }
    #card {
      width: 88%;
      position: absolute;
      bottom: 0;
      left: 50%;
      margin-left: -44%;
      perspective: 600px;
      overflow: hidden;
      height: 10em;
      background: transparent;
      .content {
        background: #FFF; 
        padding: 0.5em;
        display: inline-block;
        transform: rotateX(-90deg);
        transform-origin: bottom;
        position: absolute;
        bottom: 0;
        height: 100%;
      }
      #event-name {
        color: $dkgray;
        text-align: center;
        margin-top: 0.5em;
        padding-bottom: 0.75em;
      }
      #event-details {
        position: relative;
        width: 100%;
        white-space: nowrap;
        text-align: center;
        .col-3 {
          width: 33%;
          display: inline-block;
          color: $dkgray;
          vertical-align: top;
          float: left;
          h3 { 
            font-size: 0.6em;
            text-transform: uppercase;
            font-family: 'Montserrat', sans-serif;
          }
          i {
            color: $lavender;
            &.fa-user {
              background: $lavender;
              color: #FFF;
              border-radius: 50%;
              font-size: 0.6em;
              width: 1.5em;
              height: 1.5em;
              line-height: 1.5em;
            }
          }
          p {
            font-size: 0.6em;
            white-space: normal;
            color: $gray;
          }
        }
      }
    }
    #bg-card{
      width: 82%;
      height: 10.5em;
      position: absolute;
      bottom: 0;
      left: 50%;
      margin-left: -41%;
      perspective: 600px;
      overflow: hidden;
      .content {
        background: $gray; 
        padding: 0.5em;
        display: inline-block;
        transform: rotateX(-90deg);
        transform-origin: bottom;
        position: absolute;
        bottom: 0;
        height: 100%;
        width: 100%;
      }
    } 
  }
}
.hide, .show {
  transition: all 0.1s ease-in-out;
}
.show {
  @include hideOrShow(none, block);
  opacity: 1;
  z-index: 4;
}
.hide {
  @include hideOrShow(block, none);
  opacity: 0;
  z-index: 1;
}
.day-details {
  clear: both;
  transform: scaleY(0);
  transition: all 0.3s ease-in-out;
  margin: 0 1em 0 -1.5em;
  transform-origin: top center;
  input,.input {
    transform: scaleY(0);
    border: 0;
    box-shadow: none;
    padding: 0;
    transition: height 0.3s ease-in-out;
    width: 100%;
    display: block;
    height: 0;
    background: #FFF;
    color: $dkgray;
    font-size: 0.85em;
    font-family: 'Montserrat', sans-serif;
  }
  .expanded ~ &.expanded{
    transform: scaleY(1);
    transition: all 0.3s ease-in-out;
    input, .input {
      border: 0;
      box-shadow: none;
      padding: 1em 1.5em;
      line-height: 13px;
      transform: scaleY(1);
      box-sizing: content-box;
      margin: 0 0 0.5em;
      height: 13px;
      background: #FFF;
      transition: height 0.3s ease-in-out;
    }
    #input-arrow {
      width: 0;
      height: 0;
      position: relative;
      border-left: 7px solid transparent;
      border-right: 7px solid transparent;
      border-bottom: 7px solid #FFF;
      transition: margin-left 0.25s ease-in-out;
    }
  }
}
!

JS 

              
                var allMonths, dayArray = [], click = 0, dotw = [/Sun/gi,/Mon/gi,/Tue/gi,/Wed/gi, /Thu/gi,/Fri/gi,/Sat/gi];
function getAllDays(month, year) {
  var date = new Date(year, month, 1);
  var days = [];
  while (date.getMonth() === month) {
    var dayToPush = new Date(date);
    days.push(dayToPush);
    date.setDate(date.getDate() + 1);
  }
  return days;
}

function getYear(){
  var d = new Date();
  var curYear = d.getFullYear();
  return curYear;
}
function addElements (query, id){
  //for onload, use activeIndex+1 as query value
  document.getElementById(id).innerHTML = '';
  var allDays = getAllDays((query), getYear());
    for(var i = 0; i<allDays.length; i++){
      allDays[i] = allDays[i].toString();
    }
  var stopNow = false, counter = 0;
  for(var i = 0; i<dotw.length; i++){
    if(allDays[0].match(dotw[i])){
      stopNow = true;
    } else {
      if (!stopNow) {
        counter += 1;
      }
    }
  }
  for(var i=0; i<counter; i++){
    allDays.unshift(" ");
  }
  for(var i=0; i<allDays.length; i++){
    var singleDay = document.createElement('div');
      singleDay.className = 'day';
      singleDay.dataset.title = '';
      singleDay.dataset.location = '';
      //Parse Day
    if(allDays[i]!==" "){
      var dayOTW = allDays[i].split(' ')[2];
      if(dayOTW.charAt(0)==="0"){
        allDays[i]=dayOTW.replace(/0/gi, '');
      } else {
        allDays[i] = dayOTW;
      }
    }
    singleDay.innerHTML = allDays[i];  document.getElementById(id).appendChild(singleDay);
  }
  var allOfDays = document.querySelectorAll('#days .day');
var dayArray = [];
  for(var i = 0; i< allOfDays.length; i++){
      if(i === 6 || i === 13 || i === 20 || i === 27 || i === 34){
        // dayArray.push(i);
        // console.log(allOfDays[i]);
        allOfDays[i].outerHTML += '<div class="day-details"><div id="input-arrow"></div><div class="input"></div></div>'
      }
    }  
  document.getElementById(id).innerHTML += '<div class="day-details"><div id="input-arrow"></div><div class="input"></div><div style="clear:both"></div>';
}
//Thanks: http://stackoverflow.com/questions/4649699/is-it-possible-to-get-elements-numerical-index-in-its-parent-node-without-loopi
function whichChild(elem){
    var  i= 0;
    while((elem=elem.previousSibling)!=null) ++i;
    return i;
}
window.onload = function(){
  allMonths = document.querySelectorAll('.month');
  var monthCont = document.getElementById('months');
  for(var i=0; i<allMonths.length; i++){
    allMonths[i].innerHTML += ' ' + getYear();
  }
  addElements(0, 'days');
}
document.body.addEventListener('click',function(e){
  var currentActive = document.querySelector('#months .month.active');
  var calWidth = Number(getComputedStyle(currentActive).width.replace(/px/gi,''));
  var activeIndex = 0;
  for(var i=0; i<allMonths.length; i++){
    if(allMonths[i].innerHTML === currentActive.innerHTML){
      activeIndex = i;
    }
  }
  if(e.target.id==='nextMt'){
    if(activeIndex<11) {
      document.querySelector('#months .month:first-child').style.marginLeft = -(calWidth * (activeIndex+1))+'px';
    currentActive.className = 'month';
    allMonths[activeIndex+1].className += ' active';
    addElements((activeIndex+1), 'days');
    } else {
      document.querySelector('#months .month:first-child').style.marginLeft = '0px';
    currentActive.className = 'month';
    allMonths[0].className += ' active';
      addElements(0, 'days');
    }
  } else if(e.target.id==='lastMt'){
    if(activeIndex>0) {
      document.querySelector('#months .month:first-child').style.marginLeft = -(calWidth * (activeIndex-1))+'px';
    currentActive.className = 'month';
    allMonths[activeIndex-1].className += ' active';
        addElements((activeIndex-1), 'days');
    } else {
      document.querySelector('#months .month:first-child').style.marginLeft = -(calWidth * 11) + 'px';
    currentActive.className = 'month';
    allMonths[11].className += ' active';
        addElements(11, 'days');
    }
  }
  if(e.target.id === 'color-picker'){
    document.querySelector('#dates.show').className = 'hide';
    document.getElementById('colors').className = 'show';
    e.target.className = 'hide';
  }
  if(e.target.id === 'back'){
    document.getElementById('color-picker').className = document.getElementById('color-picker').className.replace(/hide/gi,'show');
    document.getElementById('info').className = document.getElementById('info').className.replace(/show/gi,'hide');
    document.getElementById('dates').className = document.getElementById('dates').className.replace(/hide/gi,'show');
  }
  if(e.target.className === 'color'){
    var allColors = document.querySelectorAll('.color');
    for(var i = 0; i<allColors.length; i++){
      allColors[i].className = 'color';
      if(allColors[i].id === e.target.id){
        allColors[i].className += ' active';
      }
    }
    document.querySelector('body > div').className = 'prev-'+document.querySelector('body > div').className+' '+document.querySelector('.color.active').id;
    document.querySelector('body > div').className = document.querySelector('.color.active').id;
    
  }
  if(e.target.id === 'close'){
   if(e.target.parentNode.id==='colors'){
     e.preventDefault();
     e.target.parentNode.className = 'hide';
     document.getElementById('dates').className = 'show';
     document.getElementById('color-picker').className = 'show';
   }
  }
  if(e.target.className.match(/day/gi) && e.target.parentNode.id === 'days'){
   for(var i = 0; i<document.querySelectorAll('.day-details.expanded').length; i ++){
     document.querySelectorAll('.day-details.expanded')[i].className = document.querySelectorAll('.day-details.expanded')[i].className.replace(/ expanded/gi, '');
   }
        for(var i = 0; i<document.querySelectorAll('.day.expanded').length; i ++){
     if(document.querySelectorAll('.day.expanded')[i].innerHTML !== e.target.innerHTML){
       document.querySelectorAll('.day.expanded')[i].className = document.querySelectorAll('.day.expanded')[i].className.replace(/ expanded/gi, '');
     }
   }
    if(e.target.className.match(/expanded/gi)){
      e.target.className = e.target.className.replace(/ expanded/gi,'');
    } else {
      e.target.className += ' expanded';
      
    }
    var currElm = e.target;
    while (!currElm.nextSibling.className.match(/day-details/gi)){
      currElm = currElm.nextSibling;
    }
    currElm.nextSibling.className += ' expanded';
    currElm.nextSibling.childNodes[0].style.marginLeft = (e.target.offsetLeft + 8) + 'px';
  }
  if(e.target.className === 'input'){
    e.target.outerHTML = '<input type="text"/>';
    document.querySelector('.day-details.expanded input').focus();
  }
    if(e.target.tagName === 'A' && e.target.parentNode.className === 'input'){
      click += 1;
      setTimeout(function(){
        if (click > 1){

          document.querySelector('.day-details.expanded .input').outerHTML = '<input type="text" value="'+document.querySelector('.day-details.expanded .input a').innerHTML+'"/>'; 
          document.querySelector('.day-details.expanded input').focus();
          document.querySelector('.day-details.expanded input').setSelectionRange(document.querySelector('.day-details.expanded input').value.length, document.querySelector('.day-details.expanded input').value.length);
        } else if (click === 1){
          
         document.getElementById('color-picker').className = document.getElementById('color-picker').className.replace(/show/gi,'hide');
document.getElementById('month-name').innerHTML = document.querySelector('.month.active').innerHTML.replace(' 2016','');          document.getElementById('info').className = 'show';
          document.getElementById('actual-date').style.left = document.querySelector('.day.expanded').offsetLeft + 'px';
          document.getElementById('actual-date').style.top = document.querySelector('.day.expanded').offsetTop + 'px';
          document.getElementById('dates').className = 'hide';
          TweenMax.to("#actual-date", ((document.querySelector('.day.expanded').offsetTop*2.5)/document.getElementById('calendar').clientHeight), {
  bezier: {
    values: [{
      x: 0,
      y: 0
    }, {
      x: (3*(document.getElementById('calendar').clientWidth-document.querySelector('.day.expanded').offsetLeft - 28))/4,
      y: -(1*(document.querySelector('.day.expanded').offsetTop - 9))/4
    }, {
      x: document.getElementById('calendar').clientWidth-document.querySelector('.day.expanded').offsetLeft - 26,
      y: -(document.querySelector('.day.expanded').offsetTop - 7)
    }]
  }
});
          document.getElementById('actual-date').innerHTML = document.querySelector('.day.expanded').innerHTML;
          document.getElementById('event-name').innerHTML = document.querySelector('.day-details.expanded .input a').innerHTML;
          document.querySelector('.day-details.expanded').className = document.querySelector('.day-details.expanded').className.replace(/ expanded/, '');
      document.querySelector('.day.expanded').className = document.querySelector('.day.expanded').className.replace(/ expanded/, '');
        }
        click = 0;
      }, 500);
  }
});
document.body.addEventListener('keyup', function(e){
  if(e.keyCode === 13){
    document.querySelector('.day.expanded').dataset.title = document.querySelector('.day-details.expanded input').value;
    if(document.querySelector('.day-details.expanded input').value.length >0){
      document.querySelector('.day.expanded').className += ' has-event';
         document.querySelector('.day-details.expanded input').outerHTML = '<div class="input"><a>'+document.querySelector('.day-details.expanded input').value+'</a></div>'; 
    } else {
      if(document.querySelector('.day.expanded').className.match(/ has-event/gi)){
        document.querySelector('.day.expanded').className = document.querySelector('.day.expanded').className.replace(/ has-event/gi,'');
      }
         document.querySelector('.day-details.expanded input').outerHTML = '<div class="input"></div>'; 
    }
    click = 0;
  }
});
!
999px

Console