News Trick-or-treating MUST happen on Oct. 31, and six other rules from the King of Halloween October 28, 2022 Rex Huppke, USA TODAY Comments Off on Trick-or-treating MUST happen on Oct. 31, and six other rules from the King of Halloween It has become abundantly clear America needs a refresher course on the hard-and-fast rules of Halloween. Things have gotten a bit out of hand.