EXTREMITIES William Mastrosimone’s drama about a woman who thwarts an attempted rape, then exacts a protracted revenge on her assailant. Directed by Karen Allen, who played the lead role in a 1980s off-Broadway production. Through July 27. Berkshire Theatre Group. At Unicorn Theatre, Stockbridge. 413-997-4444, www.berkshiretheatregroup.org
PYGMALION Before it was musicalized into “My Fair Lady,’’ there was still plenty of trenchant fun to be had with George Bernard Shaw’s tale of a spirited Cockney flower girl and the haughty, domineering linguist who believes he can transform her accent and demeanor so thoroughly she can pass for a duchess. Starring Robert Sean Leonard (Wilson on “House’’) as Professor Henry Higgins and Heather Lind as Eliza Doolittle. Directed by Nicholas Martin, fresh off his success with the Tony-winning Broadway hit “Vanya and Sonia and Masha and Spike.’’ July 17-27. Williamstown Theatre Festival. 413-597-3400, www.wtfestival.org
THE BILLINGSGATE PROJECT Brenda Withers has proved she is a writer to watch — first with “Matt & Ben’’ (coauthored with Mindy Kaling), then with “The Ding Dongs, or What Is the Penalty in Portugal?’’ Her new play, which coincides with Wellfleet’s 250th-anniversary celebration, explores the challenges faced by a group of amateur historians as they wrestle with a major event: the destruction by erosion of Billingsgate Island, which once sat at the entrance to Wellfleet Harbor.
July 18-Aug. 10. Harbor Stage
Company, Wellfleet. 508-349-6800,