[Nomadic Mentor]

I've ran a robot every friday during football season on a dirt track and black top for a few years with no real maintenance and it never had any real issues so I don't a night will hurt the bot. Be careful that you don't pull and donuts grass and dirt are generally not very fond of that maneuver (or test in an used corner first). Tee-shirt cannons are great for crowds, if you could burn the midnight oil I would suggest going for that. If not anything that shots or can lift of the ground would be interesting. If you're just going to have a booth make a little vex robot or base people can drive around with. People seem to be enjoy it. Just kill a kill switch near by. Hope it helps.