Filter and order a custom post type by a meta_key, like events by past and future date

WordPress Create Past & Future filters

// Set Events to date order (in admin), either future or past
// -------------------------------------------------------------
function set_events_admin_order($wp_query) {
  if (is_admin()) :

  	$post_type_req = 'events'; // change this
  	$filter_by = 'event_date'; // change this

  	$now = date('Ymd');


    $post_type = $wp_query->query['post_type'];
    $status = $_GET['status'];

    if ( $post_type == $post_type_req) {
    	$wp_query->set('meta_key', $filter_by);
		$wp_query->set('orderby', 'meta_value_num');
		

		switch($status):
			case 'future';
				$metaquery = array(
					array(
						'key'       => $filter_by,
						'value'     => $now,
						'compare'   => '>',
					)
				);

				$wp_query->set('order', 'ASC');
			break;
			case 'past';
				$metaquery = array(
					array(
						'key'       => $filter_by,
						'value'     => $now,
						'compare'   => '<',
					)
				);

				$wp_query->set('order', 'DESC');
			break;
		endswitch;

		$wp_query->set( 'meta_query', $metaquery );
    }
  endif;
}
add_filter('pre_get_posts', 'set_events_admin_order');

// Add submenus to Events
//---------------------------
function events_add_submenu(){
	add_submenu_page('edit.php?post_type=events','Future Events', 'Future', 'edit_post', 'edit.php?post_type='.$post_type_req.'&status=future');
	add_submenu_page('edit.php?post_type=events','Past Events', 'Past', 'edit_post', 'edit.php?post_type='.$post_type_req.'&status=past');
}

add_action('admin_menu', 'events_add_submenu', 10);

When using a Custom Post Type to manage events / meetings, the listing page in the admin can quickly get bloated with past events. This code creates two new sub-menu items, where one only lists the future events, the other only listing the past events.