FullCalendar: Event with tooltips/custom event attributes

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.6/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/datejs/1.0/date.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/2.4.0/fullcalendar.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/2.4.0/fullcalendar.min.js"></script>
<div style="border:solid 2px red;">
        <div id='calendar'></div>
</div>

JavaScript

$(document).ready(function() {

    var date = new Date();
    var d = date.getDate();
    var m = date.getMonth();
    var y = date.getFullYear();

    var myDataset = {
        "classes": [
            [{
                "name": "ECEC 301 Advanced Programming for Engineers Lecture",
                "days": "MWF",
                "times": "02:00 pm - 03:20 pm",
                "crn": "11215"
            }, {
                "name": "ECEC 301 Advanced Programming for Engineers Lab",
                "days": "W",
                "times": "09:00 am - 10:50 am",
                "crn": "11216"
            }],
            [{
                "name": "ECEC 301 Advanced Programming for Engineers Lecture",
                "days": "MWF",
                "times": "02:00 pm - 03:20 pm",
                "crn": "11215"
            }, {
                "name": "ECEC 301 Advanced Programming for Engineers Lab",
                "days": "F",
                "times": "02:00 pm - 03:50 pm",
                "crn": "11217"
            }
            ]
        ]
    };

    console.log(myDataset);

    $('#calendar').fullCalendar({

        editable: false,
        weekMode: 'liquid',
        handleWindowResize: true,
        weekends: false,
        defaultView: 'agendaWeek'

    });
    
    function GetDateString(myDate){
		// GET CURRENT DATE
		var date = new Date(myDate);
		 
		// GET YYYY, MM AND DD FROM THE DATE OBJECT
		var yyyy = date.getFullYear().toString();
		var mm = (date.getMonth()+1).toString();
		var dd  = date.getDate().toString();
		 
		// CONVERT mm AND dd INTO chars
		var mmChars = mm.split('');
		var ddChars = dd.split('');
		 
		// CONCAT THE STRINGS IN YYYY-MM-DD FORMAT
		var datestring = yyyy + '-' + (mmChars[1]?mm:"0"+mmChars[0]) + '-' + (ddChars[1]?dd:"0"+ddChars[0]);
        
        return datestring;
	}

    // adding a every monday and wednesday events:
    $('#calendar').fullCalendar('addEventSource',
        function(start, end, timezone, callback) {
    ...