驾到 (jiàdào) - “The arrival of an honored personage.” Even more formal and grandiose than
光临, historically used for emperors or high officials. You might hear it used playfully today, e.g., “欢迎老板大驾光临!” (Huānyíng lǎobǎn dàjià guānglín! - Welcome to the boss's great arrival!)