h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

A fantasy dinner with anyone I can choose? The faculty of Unseen University.
Dinner would unfortunately have to consist of at least half a dozen courses (not including cheese board, after dinner mints and the brandy and cigar course), but I'd like a few things from the series expanding on. What happens in the dungeon dimensions, what actually gets taught in a magic class, what did they even build the high energy magic building for in the first place?
Either that, or all of Dr. Who's incarnations. That'd make for an interesting conversation.

If you want real people, I could see enjoying an evening with the likes of Stephen Fry, Bill Bailey, Jack Dee and Rowan Atkinson. I'd be too starstruck to say anything, though, and lord only knows what I'd cook.