The Events Calendar - rewrite permalinks

/**
 *
 * Rewrite Events permalinks
 *
 */
function bis_rewrite_recurring_event_permalinks( $post_link, $post, $leavename, $sample ) {
    if ( ! empty( $post->post_type ) && $post->post_type == 'tribe_events' ) {
        if( function_exists( 'tribe_is_recurring_event' ) && tribe_is_recurring_event( $post->ID ) ) {
            $post_link = preg_replace( '/\/([\d]{4}-[\d]{2}-[\d]{2}\/?)$/', '-$1', $post_link );
        }

        $post_type_object = get_post_type_object( $post->post_type );
        $post_type_slug = ( isset( $post_type_object->rewrite ) && is_array( $post_type_object->rewrite ) && !empty( $post_type_object->rewrite['slug'] ) ) ? $post_type_object->rewrite['slug'] : '';

        if( ! empty( $post_type_slug ) ) {
            $post_link = str_replace( "/{$post_type_slug}/", "/events/", $post_link );
        }

        $post_link = user_trailingslashit( $post_link );
    }

    return $post_link;
}
add_filter( 'post_type_link', 'bis_rewrite_recurring_event_permalinks', 100, 4 );

function pm_adjust_event_query( $query ) {
    global $pm_query, $wp, $wpdb;

    // Do not run if custom permalink was detected
    if ( ! empty( $pm_query['id'] ) ) {
        return false;
    }

    if ( strpos( $wp->request, 'events/' ) !== false ) {
        preg_match('/^events\/([^\/]+)(?:-([\d]{4}-[\d]{2}-[\d]{2}))?\/?$/U', $wp->request, $slug_parts );

        if ( ! empty( $slug_parts[1] ) ) {
            // 2A. Check if the slug is assigned to any post item
            $sql_query = "SELECT post_name, post_type FROM {$wpdb->posts} WHERE 1=1 AND post_name = %s AND post_type = 'tribe_events'";
            $event_post = $wpdb->get_row($wpdb->prepare( $sql_query, array( $slug_parts[1] ) ) );

            if( ! empty( $event_post->post_name ) ) {
                $query = array(
                    'post_type' => $event_post->post_type,
                    $event_post->post_type => $event_post->post_name,
                    'name' => $event_post->post_name,
                    'do_not_redirect' => 1
                );

                if ( ! empty( $slug_parts[2] ) ) {
                    $query['eventDate']    = $slug_parts[2];
                }
            }
        }
    }

    return $query;
}
add_filter( 'request', 'pm_adjust_event_query', 2 );

function pm_redirect_old_event_urls() {
    global $wp, $post;

    if ( is_singular( 'tribe_events' ) && ( strpos( $wp->request, 'event_detail/' ) !== false ) ) {
        $product_permalink = get_permalink( $post->ID );

        wp_safe_redirect( $product_permalink, 301 );
        exit();
    }
}
add_action( 'template_redirect', 'pm_redirect_old_event_urls', 5 );