query days

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'day_of_week',
		'value'   => 'Monday',
		'compare' => '=',
		'type'    => 'CHAR',
	),
	array(
		'key'     => 'day_of_week',
		'value'   => 'Tuesday',
		'compare' => '=',
		'type'    => 'CHAR',
	),
	array(
		'key'     => 'day_of_week',
		'value'   => 'Wednesday',
		'compare' => '=',
		'type'    => 'CHAR',
	),
);