On Oct. 27 and Oct. 28, 3:30 to 6:30 p.m., participate in a scavenger hunt, take a wagon ride on the 12-acre field and create a boo-tiful Halloween craft on this unforgettable evening. See wool carding, spinning and fish net making in the historic area before greeting “Martha Washington” on the piazza of the Mansion. Burn off all the extra excitement with 18th-century dancing in the upper garden. Historic chocolate-making demonstrations and chocolate tastings will take place. A children’s costume parade will begin at 5 p.m. and prizes will be awarded for most fang-tastic “George” and “Martha” costumes. Tickets are $12 for adults and $6 for kids, 11 and under. mountvernon.org.