custom events manager slug

//add_filter('name_save_pre', 'custom_event_slug');
add_filter('wp_unique_post_slug', 'custom_event_slug', 100, 6);

function custom_event_slug($slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug='' /* @since WP3.5 */) {
    global $post;
    if($post_status != "publish") return $slug;
    if(!is_object($post)) return $slug;
    $old_slug = $slug;
    if($post->post_type == "event" && class_exists('EM_Events') ){
        $slug = array();
        $custom =get_post_custom();  //get custom fields, holds em meta data like date, location id
        $locid = $custom['_location_id'][0];                        //get the location ID for the event
        if($locid != 0) {                                           //if there is a location
            $location_meta = EM_Locations::get($locid);             //use EM_Locations class::get to get location meta
            $location_slug = $location_meta[0]->location_slug;      //get the location_slug
            $slug[] = $location_slug;

        }
        $start_date = strtotime($custom['_event_start_date'][0]);   //get the start date
        $slug[]= strftime("%Y-%m-%d");                          //reformat it

        $slug []= sanitize_title($post->post_title);                                //the original post title
        //$locid = $_POST['location_id'];
        $slug = implode("-", $slug);
    }
    if(strlen($slug)< 3 )
        $slug == $old_slud;
    return $slug;
}