gistfile1.txt

function order_featured( $query ) {
global $terms;
if( $query->is_main_query() && !is_admin() && is_post_type_archive( 'event' ) ) {
  	$meta_query = array(
			array(
				'key' => 'featured',
				'value' => 'meta_value_num',
			)
		);
		$query->set( 'meta_query', $meta_query );
		$query->set( 'orderby', 'meta_value_num' );
		$query->set( 'meta_key', 'featured' );
		$query->set( 'order', 'DESC' );
	}
    
}