Tom Grater International Film ReporterEXCLUSIVE: Momentum Pictures has bought North American rights to Stage Mother, Thom Fitzgerald’s comedy starring Jacki Weaver and Lucy Liu, and has set an August 21 day-and-date release for the pic.The movie debuted at Palm Springs International Film Festival in January. Brad Hennig wrote the screenplay, which follows a conservative Texas church choir director who inherits her recently deceased son’s drag club and tries to save it from bankruptcy.