The Startup Weekend site recommends "laptop, power cord, business cards, camera, a second monitor, keyboard, and lots of creative energy!" Danielle Morrill suggests bringing internet connectivity for when the wireless doesn't work. Tristan Kromer says "bring fruit". What else?
I am not sure I understand you question and what Startup Weekend is, but you just need essential things and some laptop to work on. Important is what you do, not what tools you have.
"The real men need only a knife"