If you didn't make it over to one of PS1's "Warm Up" parties, don't fret. Their annual summer music series ended last week, but there's still a lot happening at the Long Island City branch of MoMA. This weekend they're launching their first annual "Stoop Sale," with great bargains on art books, tee shirts, vinyl, CDs, comic books, artist's monographs and more from their Artbook shop. The sale takes place on the steps in the back courtyard on September 13, 14 and 15 from noon to 6pm daily and admission is free. Also on Sunday, September 15 at 4pm, the museum is launching "Sunday Sessions," a weekly series of events will offer "an amalgam of artistic programming -- from light, sound, and music installations to lectures by world-renowned scholars and special performances." This time around there will be two screenings of films selected by Dirty Looks NYC -- which you can RSVP to here. And don't forget that the big Mike Kelly retrospective featuring over 200 works by the late artist opens on October 13 and will be up until February 2.