I remember on October 31st of various years, my father told me not to open the door because of the children knocking on the door as part of trick-or-treating. That was years ago, and trick-or-treating hasn't been done in my area ever since 2017, 2018, 2019, or 2020 (I don't remember what year it was when they stopped trick-or-treating in my area).
I guess they don't do that because of school, lack of interest, parents won't allow them to do so, or some other reason.
Back to the question: Do people trick-or-treat in your area?
Must be they get used to ringing the doorbell and doors opening and be greeted. Not someone in the shadows that says