Thinking about the Ambassador idea some more: If you had enough people, you could also set up a regular schedule of Ambassador Tours. At fixed times, a group of Ambassadors will meet at Location X, and anyone who would like an introduction the the TAM experience can meet them, and have a tour that shows them where all the important things are: Registration Desk, Conference and Lunch Rooms, the Del Mar, and the locations of other events like Poker and the Drinking Skeptically.
We could also let the "Celebrity" guests know about this, so if an Ambassador sees a Name Skeptic as they're leading a tour, they can flag them down and introduce them to the group. Lots of newbies seem too intimidated to do that themselves. I introduced at least one guy to Randi, and another to Brian Dunning last year because of this.