Some friends and I demo'd our autonomous mobile robot
http://maslab.mit.edu/2011/wiki/Team_Two/Final_Paper for this and it was a lot of fun. I nearly lost my voice after only two hours. I wish it was more than just 5 hours though, at the very least because I would've liked to see all the neat things myself. Unfortunately, MIT can't realistically have 20,000-30,000 extra people on campus for long periods of time.