Trick-or-Treat in Dyersville will be on Halloween, Tuesday, October 31 from 5:30 - 7:30 pm. Participating residents should turn on their porch lights when they are ready to greet Trick-or-Treaters and turn them off when finished. Trick-or-Treaters are reminded to obey porch lights and watch for traffic. Those choosing not to participate should leave their porch lights off.