My son (the Grenadier Guard) and one of his friends cleaned up the Halloween they went into a local seniors’ home. The residents had decorated the place, and had lots of candy ready, but they were the only kids to show up there the whole night, and thus came in for all the costume admiration and bestowing of goodies.
https://www.creativechild.com/articles/view/the-history-of-trick-or-treating
Trick or Treat Facts & Worksheets
Bonus: some trick-or-treating tips and an article on something else kids often do on Halloween.
https://www.verywellfamily.com/how-to-trick-or-treat-with-your-child-for-the-first-time-6361596
https://www.britannica.com/story/kids-are-strategic-about-swapping-halloween-candy
Time Travelling With Kids 