Changes data for a single event, rerendering the event.

.fullCalendar( ‘updateEvent’, event )

event must be the original Event Object for an event, not merely a reconstructed object. The original Event Object can obtained by callbacks such as eventClick, or by the clientEvents method.

Here is how you might update an event after a click:

  eventClick: function(event, element) {

    event.title = "CLICKED!";

    $('#calendar').fullCalendar('updateEvent', event);