Soundstreams is inviting actors, playwrights, composers, and directors to Behind the Curtain: Developing New Musicals and Operas, a salon to discuss and learn about these underrepresented genres. Meet Acting Up Stage’s Mitchell Marcus and SummerWorks Musical Works’ Tracy Michailidis. 7PM. August 16. Pre-registration required. Gardiner Museum. Free. StoryMobs stages a reading of Robert Munsch’s The…