Lovely 404 Issue w/ Custom Post Type – take a look

I’m trying to rewrite my permalinks using meta data from my post. The permalink rewrite works- but I’m getting the 404 issue.

I’ve flushed by visiting the permalink settings page, and still no dice.

Could someone offer a clue as to why this wouldn’t work?

add_filter('post_type_link','calendar_link_filter',1,3);

function calendar_link_filter( $post_link, $id = 0, $leavename = FALSE ) {
        $post = get_post($id);
        if($post->post_type != 'super_duper') {
                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_action( 'init', 'create_my_post_types' );

function create_my_post_types() {
	register_post_type( 'super_duper',
		array(
			'labels' => array(
				'name' => __( 'Super Dupers' ),
				'singular_name' => __( 'Super Duper' )
			),
			'hierarchical' => false,
			'show_ui' => true, // UI in admin panel

			'public' => true,
			'rewrite' => array('slug' => 'events/%cal_year%/%cal_month%/%cal_day%'),

		)
	);
}