下面是代码的更新版本，它还使用Transients API.

/**
 * If post status is pending, set transient containing error message and
 * change the redirect location.
 * Filters slashed post data just before it is inserted into the database.
 *
 * @param array $data    An array of slashed post data.
 * @param array $postarr An array of sanitized, but otherwise unmodified post data.
 * 
 */
add_filter( \'wp_insert_post_data\', \'wpse242399_wp_insert_post_data\', 99, 2 );
function wpse242399_wp_insert_post_data( $data, $postarr ) {
    if ( $data[\'post_type\'] !== \'revision\' && $data[\'post_status\'] === \'pending\' ) {

        set_transient( get_current_user_id() . \'_wpse242399_post_pending_notice\', 
            __( \'Your post has been submitted for review.\', \'your-text-domain\' )
        );

        add_filter( \'redirect_post_location\', \'wpse242399_redirect_post_location\', 99 );
    }

    return $data;
}

/**
 * Remove the filter for the redirect location
 * and perform the redirect.
 */
function wpse242399_redirect_post_location( $location ) {
    remove_filter( \'redirect_post_location\', __FUNCTION__, 99 );

    return add_query_arg( [
            \'post_type\' => \'event\',
            \'author\'    => get_current_user_id(),
        ], admin_url( \'edit.php\' )
    );
}

/**
 * Check to see if it\'s necessary to display a message.
 * If so, delete the transient and output the message.
 */
add_action( \'admin_notices\', \'wpse242399_admin_notices\' );
function wpse242399_admin_notices() {
    $message = get_transient( get_current_user_id() . \'_wpse242399_post_pending_notice\' );

    if ( $message ) {
        delete_transient( get_current_user_id() . \'_wpse242399_post_pending_notice\' );

        printf( \'<div class="%1$s"><p>%2$s</p></div>\',
            \'notice notice-success is-dismissible wpse242399_post_pending_notice\',
            $message
        ); 
    }
}