City of Hammond Announces 2016 Trick-or-Treat Hours By: City of Hammond Last Updated: October 17, 2016 facebook twitter linkedin email print Mayor Thomas M. McDermott, Jr. has announced that the 2016 Trick-or-Treat hours for Halloween on Monday, October 31, will be from 5pm until 7pm. Please call 219.853-6301 or 219.853-6378 if you have any questions. Have a safe and Happy Halloween!