As October speedily arrives to a close and we find ourselves fully in the throes of fall—with Halloween decorations, an assortment of pumpkin-themed treats and colder weather—I’m reminded of my time living in Tucson, Arizona before moving to Boston. The weekend after Halloween in Tucson is a special time. Usually occurring on the second weekend of November, Tucson hosts an event called the All Souls Procession , which has been taking place for 36 years. This unique public art procession,...