I've just realized why I'm not recognizing the festival lot issue in IP. It's because I don't have one (smacks head...ouch, that was bit too hard). I've used that world as a vacation destination only (Traveler mod) thus far, not a homeworld as it was designed to be. Since I only have two seasons allowed in tropical worlds, instead I set up a Big Park or something like that with festival-like features that stays constant and it does get some draw especially when at least one of my actives visits it. I don't need to allow for apple bobbing and snowboarding because fall and winter are not going to happen there anyway, for me.
@IreneSwift - On the Humble Home issue, is it possible that you have some invisible object on the lot, possibly underground, that is drawing them in? I had this on a farm I built over what was once a fishing hole and accidentally left a fish spawner in place, so sims would come onto my lot all hours of the day and night uninvited and ungreeted, looking for a place to fish. There might other such objects or spawners I'm not thinking of that could have such an effect.
