functions.php

<?php
/*
 * If you already have something in your functions.php, please remove these first few lines
 */
 // Usage tribe_is_past_event( $event_id )
function tribe_is_past_event( $event = null ){
	if ( ! tribe_is_event( $event ) ){
		return false;
	}
	$event = tribe_events_get_event( $event );
	// Grab the event End Date as UNIX time
	$end_date = tribe_get_end_date( $event, true, 'U' );
	
	return time() > $end_date;
}