September is the best time in the city: Everyone comes back from vacation, the weather’s great, and suddenly there are more art openings than you could possibly attend. If you had to pick two tonight, we’d recommend starting at the Kitchen, where the season kicks off with Alix Pearlstein’s After the Fall, a four-channel, in-the-round video installation staged within a black-box theater, in which one group of performers acts out a confrontation while the other group simultaneously passes judgment on the unfolding drama. Then hop the L train to Factory Fresh for the opening of their new street-art show Power and Currency, featuring loads of fascinating pieces on sex, wealth, technology, and authority by Aiko, Audio Jockey, Curtis Readel, D*Face, and ESPO, among others. “After the Fall,” from 6 to 8, the Kitchen, 512 West 19th Street, 212-255-5793, free; “Power and Currency,” from 6 to 10, Factory Fresh, 1053 Flushing Avenue, Brooklyn, factoryfresh.net, free

Fri., Sept. 5, 6 p.m., 2008