You could contact one of these guys maybe...
I should have mentioned this earlier, but I'll actually be sitting in on a class when I visit the campus. When you schedule a course visit a student escort is assigned to you. There's also an optional lunch that I'll be attending to meet other current students, and most likely a few of the official Haas ambassadors shown on the website you mentioned.
I'm looking for someone to meet up with informally who has been a member of this site. Just thought it would be cool to sit and chat with someone who is also a part of the GC community.