An afternoon of Halloween-themed activities at this local farmed animal sanctuary. Includes a costume contest, face painting, trick-or-treating, and a chance to meet various animals, including a potbellied pig and goats. Also, plant-based food and desserts. No dogs allowed. Noon–4 p.m., 20179 McKernan, Chelsea. Tickets $25 (kids, $10; 2 & under, free) in advance at barnsanctuary.org. (734) 270–6845.