I moved into a 378-unit apartment complex with indoor hallways a few months ago and thought that would be ripe for trick-or-treaters since it is indoors and safe. Didn't get a single person.
My parents live in a house in a neighborhood where 10 years ago got 20-30 kids, and every year it has dwindled down until this year they got zero. It was a little chilly, but no rain.
Not sure why there is such a downturn on trick-or-treaters....at least in my area. Perhaps the demographics have changed to more people that don't celebrate the holiday, paired with parents taking their kids to church harvest festivals and trunk-or-treats where they feel safer. Not sure. All I know is.....more candy for me!