These docs are for an old release.
Info on upgrading to version 2/3
removeEventSource 1.2
Dynamically removes an event source.
.fullCalendar( ‘removeEventSource’, source )
Events from the source will immediately be removed from the calendar.
Since version 1.5, the source parameter has become rather relaxed.
You can provide an event source’s Array/URL/Function
or you can specify the full Event Source Object.
Prior to version 1.5, things were more strict. You must specify a reference to the original Array/URL/Function.