This event is sold out.

Emerging professionals: join us for the second annual Ultimate Megafort. Learn about basic fort structures from Museum staff, then put your newfound skills to use. Join others to design and construct a cardboard fort, then engage your opponents in a foam ball battle.

Registration includes construction materials, snacks, and beverages. Costumes encouraged.

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