fullcalendar addEventSource not adding event array to calendar

I am creating an on-call schedule in which the user selects the group with a member list and the length and type of rotation. When the user clicks the 'Create Schedule' button, a list of events are displayed on the calendar representing this rotation schedule. The events are created and added to an event array but they will not display on the calendar. When the code reaches,

 $('#edit_calendar').fullCalendar('addEventSource', newEvents);

the application just hangs and no events are displayed on the calendar. This is the function that is called for the click event:

$("#rotation_schedule_btn").click(function () {
    //create member list order    
    var memberList = [];         
    $("#rotationList li").each(function () {
        memberList.push({
            id: $(this).attr('id'),
            name: $(this).text(),
            color: $(this).css('background-color')
        })
    });
    //start and end date and time for new schedule
    var startDate = new Date($('#schedule_start_date').val());
    var endDate = new Date($('#schedule_end_date').val());
    //remove events between startDate & endDate
    $('#edit_calendar').fullCalendar('removeEvents', function (event) {
        if (event.start.toDate() >= startDate && event.start.toDate() <= endDate
               || event.end.toDate() >= startDate && event.end.toDate() <= endDate) {
            return true;
        }
    });
    //Create events from rotation schedule selected
    var newEvents = [];
    var rotation_length = $('#rotation_type_select option:selected').val();
    var rotation_start_date = new Date(startDate);
    var rotation_end_date = new Date(rotation_start_date);
    rotation_end_date.setDate(rotation_end_date.getDate() + parseInt(rotation_length));
    rotation_end_date.setMinutes(rotation_end_date.getMinutes() - 1);
    var member_index = 0;
    while (rotation_end_date <= endDate)
    {
        var event = new Object();
        event = {
            title: memberList[member_index].name,
            start: rotation_start_date,
            end: rotation_end_date,              
            objectID: memberList[member_index].id,
            color: memberList[member_index].color,
            allDay: true,
            textColor: 'black'
        };
        newEvents.push(event);
        rotation_start_date.setDate(rotation_start_date.getDate() + parseInt(rotation_length));         
        rotation_end_date.setDate(rotation_end_date.getDate() + parseInt(rotation_length));
        if ((memberList.length - 1) == member_index)
        {
            member_index = 0;
        }
        else {
            member_index++;
        }
    }           
    //Render events on calendar
     $('#edit_calendar').fullCalendar('addEventSource', newEvents);
}); //end create schedule button click

Why won't the newEvents array display on the calendar? I would greatly appreciate it if you can tell me where I have gone wrong.

Thanks.

UPDATE After reviewing the newEvents array, it seems that all of the start and end dates are the same. There are 3 events, each event should last 1 week (7 days). But all of the events have the same start and end date.