I think I found your other two questions. One about a good place to sleep and the other about how many people stay through the whole fest.
Ken Begg's site has some good quick pointers about the fest here:
http://www.jabootu.com/events.aspAs for the early morning nap: just bring a sleeping bag. Numerous people catch naps during the wee hours, when the movies are sluggish. In fact, the organizers usually put something dreadfully slow on to help you out.
Per Jabootu, B-Fest takes place at the Norris University Center on the campus of Northwestern University in Evanston, Illinois. Finding a Days Inn or other accommodation nearby shouldn't be too hard via their website (most chains have a locator).
No idea how many of us stay the full 24 hours, but I'd say around 200 if I had to guess.
Andrew