Adds venue and city filters to event listings. Eg. [wpt_events venue="Ritz" city="El paso"]. For a full explanation see: http://www.slimndap.com/add-venue-and-city-filters-to-event-listings/.

wp-theatre-venue-city-filter.php

/**
 * Adds venue and city filters to the default options for event listings.
 * 
 * @param	array 	$defaults	The current defaults.
 * @return 	array				The defaults with venue and city added.
 */
function add_venue_filter_to_events($defaults) {
	$defaults['venue'] = false;
	$defaults['city'] = false;
	return $defaults;
}
add_filter( 'wpt/frontend/shortcode/events/defaults', 'add_venue_filter_to_events', 10 );
add_filter( 'wpt/events/get/defaults', 'add_venue_filter_to_events', 10 );
		
/**
 * Adds venue and city meta_queries to event query args.
 * 
 * @param	array 	$args		The current event query args.
 * @param	array 	$filters	The filters for this listing.
 * @return 	array				The new event query args.
 */
function add_venue_filter_events_query($args, $filters) {
	if ( $filters['venue'] ) {
		$args['meta_query'][] = array(
			'key' => 'venue',
			'value' => $filters[ 'venue' ],
		);
	} 
	if ( $filters['city'] ) {
		$args['meta_query'][] = array(
			'key' => 'city',
			'value' => $filters[ 'city' ],
		);
	} 
	return $args;
}		
add_filter( 'wpt/events/get/args', 'add_venue_filter_events_query', 10, 2 );