America’s oldest museum is turning 240! Celebrate The Charleston Museum’s birthday at this oyster roast complete with a full bar and live bluegrass by Blue Plantation Band. Eat your fill and then take part in a curator-led history walk through the fields next to the Stono River, containing wildlife habitats and archaeological sites from the prehistoric, Colonial, Antebellum, and Postbellum eras. The Dill Sanctuary, 1163 Riverland Dr. Sunday, 2-5pm. $50; $35 member. (843)928-3493, www.charlestonmuseum.org