Join us for the third annual Ultimate Megafort in the Museum's Great Hall. Design and construct a cardboard fort then engage your opponents in a foam ball battle.

Registration includes construction materials, snacks from Union Kitchen, and beverages courtesy of Port City Brewery. Costumes encouraged.

Free for Keystone Society members, $20 non-Keystone Society member. Ages 21 and up. Pre-registration is required.

Registration for Keystone Society members begins January 25. Keystone Society members must log in in order to reserve and purchase additional tickets. For log in assistance, please contact the Membership Department at 202.272.2448 or membership@nbm.org. 

This event has sold out.