Wiktionary
advance person
n. Someone who travels to a destination in order to arrange accommodation, meetings, security, etc. for one or more celebrity, politicians, business leaders, or other public figures who will arrive subsequently.
Usage examples of "advance person".
Cozzano emerged from one of the cars, waved cheerily to a number of supporters who had gathered in back for a brief sight of the Great Man, and followed an advance person into the back of the hall.