7th Annual Trick-or-Treat at the Square Event! Belvedere Square’s Seventh Annual “Trick or Treat at the Square” offers a fun-filled Halloween celebration for the young and young at heart. Among the treats for families: music by DJ Chris, a Monster Mash dance lesson and performance by The White Marsh Ballet Academy, surprises from Square merchants, food and drink specials, a costume contest (18 and under), pumpkin decorating (free while supply lasts), new trunk-or-treating from community members, including Waldorf School of Baltimore,…