I'm wondering if perhaps an actor, maybe two show up for the grand opening / to ride / promote the ride?
The first opening was a grand one, as they had a light show, had all the actors involved, and even John Williams was there. I do not remember much of the DA opening, but I do know there were actors that shown up to try the rides and did some promotional work. I wasn't there, so I do not know much of it and cannot recall if there was really an opening "event" for DA.