Attended tickets query

// WP_Query arguments
$args = array(
	'post_type'              => array( 'event_ticket' ),
	'post_status'            => array( 'publish' ),
	'meta_query'             => array(
		array(
			'key'     => '_product_id',
			'value'   => '1,2,3',
			'compare' => 'IN',
		),
		array(
			'key'     => '_attended',
			'value'   => 'yes',
		),
	),
);

// The Query
$query = new WP_Query( $args );