The Harlem Stage Gatehouse Free fall festivals throughout the neighborhood—plus more fun things to do this weekend in Harlem and beyond. SoHarlem Pop-Up October 1-November 19; Wed, Fri & Sat 11am-4pm, Thu noon-7pm FREE West Harlem The Malt House, 471 W 126th St between Morningside Ave and Amsterdam Ave Come meet the designers at this local creative incubator and shop their one-of-a-kind products—think clothing, accessories, jewelry and more. Harlem Stage Kids Day Saturday, Oc