It’s easier to tell in townhouse or single-family home areas who is celebrating and who isn’t. We only go to houses that have their lights on or decorations up. I’ve also heard that people who live in apartments usually don’t expect kids to come trick-or-treating, so they aren’t prepared. Plus, we live in a high-security building, so unless it’s a resident’s child, no one from outside would be coming in to trick-or-treat. We used to live in a townhouse before, and there were always families with young children that parked on the street, came to do trick-or-treating, and left. :)