Edit in JSFiddle

  var currentMonth = moment().format('YYYY-MM');
  var nextMonth    = moment().add('month', 1).format('YYYY-MM');

var events = [
    { date: currentMonth + '-' + '10', title: 'Persian Kitten Auction', location: 'Center for Beautiful Cats' },
    { date: currentMonth + '-' + '19', title: 'Cat Frisbee', location: 'Jefferson Park' },
    { date: currentMonth + '-' + '23', title: 'Kitten Demonstration', location: 'Center for Beautiful Cats' },
    { date: nextMonth + '-' + '07',    title: 'Small Cat Photo Session', location: 'Center for Cat Photography' }
  ];
$("#full-clndr").clndr({
    template: $("#full-clndr-template").html(),
    events: events
});

<div id="full-clndr"></div>
<script type="text/template" id="full-clndr-template">
<div class="clndr-grid">
	<div class="days-of-the-week clearfix">
	    <% _.each(daysOfTheWeek, function(day) { %>
		    	<div class="header-day"><%= day %></div>
	    <% }); %>
	</div>
	<div class="days clearfix">
	    <% _.each(days, function(day) { %>
            <div class="<%= day.classes %>" id="<%= day.id %>">
                <span class="day-number"><%= day.day %></span>
                <% switch(day.events.length) { %>
                    <% case 0: break; %>
                    <% case 1: %>
                         <div>1 event</div>
                    <% break; default: %>
                        <div><%= day.events.length %> events</div>
                <% } %>
                <div><%= day.events.length %></div>
            </div>
	    <% }); %>
	</div>
</div>
</script>

#full-clndr {
  background-color: #ebebeb;
  font-weight: 700;
  -moz-box-shadow: 4px 4px 0 #343434;
  -webkit-box-shadow: 4px 4px 0 #343434;
  box-shadow: 4px 4px 0 #343434;
}
#full-clndr .clndr-grid {
  float: left;
  width: 65%;
  border-right: 2px solid white;
}
#full-clndr .clndr-grid .days-of-the-week {
  width: 100%;
  background-color: #3883a3;
}
#full-clndr .clndr-grid .days-of-the-week .header-day {
  float: left;
  width: 14.2857%;
  padding: 14px;
  text-align: center;
  color: white;
}
#full-clndr .clndr-grid .days {
  width: 100%;
}
#full-clndr .clndr-grid .days .day,
#full-clndr .clndr-grid .days .empty {
  float: left;
  width: 14.2857%;
  height: 66px;
  padding: 24px 0;
  text-align: center;
  color: #4f4f4f;
  background-color: #ebebeb;
  border-bottom: 2px solid white;
  background-image: url('./triangle.svg');
  background-size: cover;
  background-position: center;
}
#full-clndr .clndr-grid .days .day.event .day-number,
#full-clndr .clndr-grid .days .empty.event .day-number {
  padding-bottom: 4px;
  border-bottom: 2px solid #3883a3;
}
#full-clndr .clndr-grid .days .today {
  background-color: white;
  background-image: none;
}
* {
  margin: 0;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}
body {
  font-family: Inconsolata, Monaco, 'Andale Mono', Courier;
  font-size: 18px;
  color: #212121;
}
.clearfix:after {
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  line-height: 0;
  height: 0;
}
.clearfix {
  display: inline-block;
}
strong {
  font-weight: 700;
}
@media all and (max-width: 768px) {
  #full-clndr .clndr-grid {
    width: 100%;
    border: none;
  }
}