Every Halloween for almost 20 years, children have descended on downtown Gainesville for Trick-or-Treat on the Square and this year will be no different. The Gainesville Communications and Tourism Department has put on the event “as long as (they) can remember,” Main Street Gainesville Manager Regina Mansfield said. From 3-5 p.m. Oct. 31, stores on the square are scheduled to hand out candy and treats to children clad in colorful and scary costumes.