The Boys & Girls Club of Northern Westchester hosts its trunk-or-treat and Halloween bash, with decorated trunks, games, face painting and complimentary cider and donuts from 4 to 6pm. The teen-run Liberty Keystone Haunted Hallway runs 5 to 7pm ($5 per person). Costumes encouraged; RSVP to cbeaudreault@bgcnw.com.