The Make:Philly BBQ. We will have a water rocket launcher. We will have Meat and Veggies to throw Bar-B-Queue. And we will have a bunch of great makers, artists, hackers, and geeks to hang out.
Last year we had about 10 water rockets, some flew, some flew (apart into little pieces). We supply the water and the launcher, but we don't supply the rockets. If you want to launch a rocket, build one and bring it along.