Waterloo Trunk or Treat is 6-8 p.m. Oct. 31. Main Street will be closed from Third to West Mill streets as local merchants, church groups and organizations have their trunks decorated and full of treats. Stop by St. Paul United Church of Christ for free chili dogs, pepper bellies, hot cocoa and hot cider. And end your day at the Waterloo Fire Department for candy inspection and free hot dogs and drinks.