How to handle an incorrect VIP list before opening doors

In my day-to-day, I handle attractions with private events, wristbands, and various guest lists. The problem that made me stop was this: the VIP list had names that did not appear on the sponsor's list. The symptom that made me investigate it seriously was that security wanted to let only one version through and the host was busy. I preferred not to improvise, because a quick fix can hide the…