Anyone who has the cops knocking on their door for having too many guests during Thanksgiving should tell them to go fuck themselves. I get it, though, that many people aren't confrontational like that. For you folks, there's a very simple, non-confrontational solution here: Just have your guests park their cars a little farther down the street and walk to your place. Park one street over and walk. Park all over the host's fucking neighborhood. Park five cars at some retail store parking lot and drive two packed cars to the host's place. Ignore any knocks at the door.