I saw there was a fix implemented for this in Overwatch, but I've never seen it working. For instance, there's an inactive family of teens that are always trick or treating (kids, too) no matter what season it is.

Are there any plans to revisit this fix or am I the only one still seeing random trick or treaters?

I don't want to stop the holiday or visitations altogether, by the way. I'd just like to see the little buggers on Halloween night only.

You aren't the only one. On the other extreme, I've disallowed the holiday in Tempest, I've changed the ToT settings in Retuner several times, to the extent that it should be impossible for ToT to happen. Yet it still does occasionally, year round.

A player here (I think, guess it could have been another forum) suggested that having pumpkins on your lot of any kind, even harvested ones in the fridge, will attract them. Might be a different system or over and above the usual holiday-related one but I've never de-pumpkined any of my lots to see if doing so stops things cold.