Fall Harvest Family Days at Mount Vernon. Oct 27, 28, 9am – 5pm. The entire family enjoys autumn activities including wagon rides, wheat treading in the 16-sided barn, 18th-century dancing demos, a straw bale maze, farrier (blacksmithing) demonstrations, apple-roasting, corn husk dolls demonstrations and early-American games and music. Potomac River sightseeing cruises are half-price this weekend only. Admission: adults, $15; Children ages 6-11, $7; and Children under 5 FREE. 3200 Mount Vernon Memorial Hwy, Alexandria. www.mountvernon.org