"Treason of the Blackest Dye" Exhibit: The True Story of Arnold, André, and Three Honest Militiamen

An exhibition developed by Revolutionary Westchester 250 based on new primary research by RW250 Vice President Char Weigel takes a deep dive into the people and events behind Benedict Arnold’s treason and the capture and execution of British Major John André. Curated by Char Weigel (RW250) with Marion Osmun, Alan Richardson and Pat Ryan (Irvington Historical Society). Open to the public Thursdays and Saturdays 1 – 4 pm through July 23, 2026. Final dates are July 9, 11, 16, 18, and 23 from 1:00–4:00 p.m. July 19 from 11:00-1:30pm.