advance person

noun1

1. •
   Someone who travels to a destination in order to arrange accommodation, meetings, security, etc. for one or more celebrities, politicians, business leaders, or other public figures who will arrive subsequently.

   • It was a stretch for even the most resourceful advance person: a 3:30 a.m. airport rally in Des Moines, Iowa, on Election Day 1988. The event was part of Michael Dukakis's last campaign trip. — 1992