Now in its fifth year, the Rawstock Short Film Festival has grown from a scrappy showcase for local filmmakers to a well-established—thanks to ACT's Central Heating Lab—mini-fest of shorts from all over. This year's barely-a-short centerpiece and towering highlight: David Lowery's St. Nick, an impeccably artful 70-minute study of two kid runaways in Texas. Imagine a nearly wordless Stand by Me as directed by Terrence Malick and you'll get a sense of its tough, sweet magic. (ACT Theatre, 700 Union St, 292-7676. 8:45 pm, $15.)