Disable events clicking in fullcalendar

This may give you an idea (hope you can handle that): https://stackoverflow.com/questions/7813271/how-to-disable-event-links-in-fullcalendar-when-using-google-calendar-feed

Or, try using the em_calendar_event_data filter hook to return the empty url (not tested):

// return empty event url in the calendar
function df_em_calendar_event_data( $data, $event ) {
	$data['url'] = false;
	return $data;
}
add_filter( 'em_calendar_event_data', 'df_em_calendar_event_data', 10, 2 );