These docs are for an old release. Info on upgrading to v4
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Dynamically removes an event source.

.fullCalendar( ‘removeEventSource’, source )

Events from the source will be immediately removed from the calendar.

The source parameter is rather flexible. You can provide an event source’s id/Array/URL/Function or you can specify the full Event Source Object.

To remove multiple event sources at once, resulting in a single re-render, use removeEventSources.