FullCalendar addEventSource isn't working [closed] - fullcalendar

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On page load I have a function that sets my event sources like this:
var source1 = {
url: '/Feed1.aspx?param=abc',
color: '#4793E6',
textColor: 'black'
};
var source2 = {
url: '/Feed2.aspx?param=abc',
color: '#4793E6',
textColor: 'black'
};
Then I create the FullCalendar doing something like this:
$('#Calendar').fullCalendar({
eventSources: [
source1,
source2
]
});
This successfully loads both sources and renders the calendar. Then after changing a value using a drop-down on the page I want to remove source1 and source2, recreate them based on the changed value and refetch the events doing this:
$('#calendar').fullCalendar('removeEventSource', source1);
$('#calendar').fullCalendar('removeEventSource', source2);
var source1 = {
url: '/Feed1.aspx?param=defgh',
color: '#4793E6',
textColor: 'black'
};
var source2 = {
url: '/Feed2.aspx?param=defgh',
color: '#4793E6',
textColor: 'black'
};
$('#calendar').fullCalendar('addEventSource', source1);
$('#calendar').fullCalendar('addEventSource', source2);
/* According to the documentation this is NOT needed, but I tried anyway */
$('#calendar').fullCalendar('refetchEvents');
The event sources are successfully removed, but after changing the source values (using the same successful function as I do initially) and re-adding them, the fullCalendar doesn't try to fetch the events automatically which according to the documentation it's supposed to and still doesn't when I manually call refectchEvents.
No JavaScript errors are being thrown it just doesn't properly alter the sources and/or refetch the events.
What am I doing wrong?

Answer 1

Answer from comment
Be careful to use case sensitivity when getting elements by Id.
Don't feel bad though, it happens to all of us at one time or another!