Off Center for the Dramatic Arts — At the Off Center for the Dramatic Arts in Burlington, I’ve seen wildly wacky romps such as Saints & Poets Production Company’s O, Caligula! I’ve taken in dark dramas by playwright Stephen Goldberg. I’ve nearly peed my seat laughing at comedy troupes Stealing From Work and Potato Sack Pants Theater Company. I’ve witnessed wildly diverse shows from emerging artists and seasoned professionals. In this intimate black-box theater, human alchemy — onstage and in the audience — is wondrously inevitable.