register_post_type and rewriting issue

I’m attempting something that I’ve gotten to half work.

I have a custom post type registered as calendar. This post type is essentially an event. I have a custom meta box for the event date, event start time and event end time as well as some other ancillary information.

What I want to do is have a permalink to this event in this format:

/events/year/month/day/post-name

The year, month, and day variables are NOT the publish year, month, and day, but rather, the values stored in wp_postmeta. I’ve gotten my permalink to format correctly using the meta values, but I get a 404 when visiting. I believe this is because I have not registered the rewrite.

Here’s the code:

add_action( 'init', 'create_calendar_type' );
	function create_calendar_type() {
	  register_post_type( 'calendar',
	    array(
	      'labels' => array(
	        'name' => __( 'Events' ),
	        'singular_name' => __( 'Event' )
	      ),
	      'public' => true,
	      'rewrite' => array('slug' => 'events'),
	      'show_ui' => true,
	      'capability_type' => post,

	    )
	  );
	}

function calendar_link_filter( $post_link, $id = 0, $leavename = FALSE ) {
    	$post = get_post($id);
    	if($post->post_type != 'calendar') {
    		return $post_link;
    	}
    	$date = get_post_meta($post->ID,'event-start-date',true);
    	$date = strtotime($date);
    	$str = $post_link;
    	$str = str_replace('%cal_year%',date("Y",$date),$str);
    	$str = str_replace('%cal_month%',date("m",$date),$str);
    	$str = str_replace('%cal_day%',date("d",$date),$str);
    	return $str;
  	}
  	add_filter('post_type_link','calendar_link_filter',1,3);

When I create an event, the permalink correctly formats under the post title upon publish and upon entering a value for the event date.

I get a 404 after that.

I’m wondering what I need to do to register the rewrite.

Any clues into this?