What do we call personnel who serve VIPs in a formal ceremony or dinner?

What I can find through Google is “servers” or “waiting staff”.

But are there any other words or phrases that fit the position better?

**Add on explanations**

What do we call personnel who serve VIPs, not in term of food but as an assistant who tells time, passes message to and from someone and escorts VIP to the stage, etc., in a formal ceremony (e.g., parade and dinner) as a temporarily assigned position by the event organiser instead of an employed position by the VIP?