Each van had a different offering: an upside-down ball pit (a moving van loaded with helium balloons, crowded with people, creating the effect of actually being upside down in a ball pit, an uncomfortable sensation), the Dream Library (where you could deposit or check out dreams, as you wish), the Grope a Clown truck ('nuff said), the bowling van (hands down the coolest one to stand next to and listen to: rooooooolll, boom!), the Mac-n-Tude truck (set up like a Jersey Diner, with gum chewing waitresses fully in role, serving - yes - Mac-n-Cheese), and even a fine dining truck (3 course meal with wine pairings, white tablecloth and all).
The Night Market isn't an SF original idea. As I understand it, the first one took place in Brooklyn, but this was the SF premiere. It kind of devolved into a Burning Man hipster block party at some point, after visiting many of the trucks, or deciding the lines were too long to wait. But it was inspiring, I have to admit, as guerilla artwork often is.
This is the kind of cultural movement, though, that I admire. Good job, to everyone who made it happen.