query for classes by day of week

// WP_Query arguments
$args = array(
	'post_type'              => array( 'acting_classes', 'improv', 'voice', 'musictheater', 'dance' ),
	'order'                  => 'ASC',
	'meta_query'             => array(
		'relation' => 'AND',
		array(
			'key'     => 'day_of_week',
			'value'   => 'Monday',
			'compare' => '=',
			'type'    => 'CHAR',
		),
		array(
			'key'     => 'day_of_week',
			'value'   => 'Tuesday',
			'compare' => '=',
			'type'    => 'CHAR',
		),
	),
);

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