Historians Bow and Norah Van Riper share the dramatic story of the Holmes Hole Liberty Pole, and the young women whose midnight act of sabotage became one of the Island’s most celebrated moments of resistance during the American Revolution. July 21, 5 to 6 pm, at the Martha’s Vineyard Museum. Museum members $15, nonmembers $25. 151 Lagoon Pond Road, Vineyard Haven. Register at mvmuseum.org/registration-07-21-26.