You know the drill: A group of playwrights convenes at night, with eight hours for each of them to write a sketch. In the morning, these playlets are cast and the directors and actors have eight hours to rehearse. That night, the piping-hot plays debut for a paying audience. Confusion, missed cues and cracking up ensue. In this Off Broadway edition, a benefit for Roundabout Underground and the New Play Initiative, the playwrights are all RU alumni; the cast includes Reed Birney, André De Shields, Beanie Feldstein, Betty Gilpin, Gideon Glick, Mamie Gummer, Nina Hellman, Richard Kind, Aasif Mandvi, Arian Moayed, Jeremy Shamos, Sarah Steele and Leslie Uggams.