Shown, from left, taking part in the Malden Chamber of Commerce’s 17th annual trick-or-treat in Malden Square were Malden Addiction Recovery Resource Specialist Paul Hammersley, Malden Chamber of Commerce Executive Director Joan Ford Mongeau, Mayor Gary Christenson – as “Vax Man” – and Gina, a stilt walker and owner of Aerialicious Entertainment. (Courtesy/Malden Chamber)