Answers would be 0, 1, 2, and 3. No need for any number higher than that.
We used to go to a really good Halloween party held by Dave Hogan, president of the Los Angeles Grim Society but like all things, that seems to be in the past. He has not updated this site in over two years, and I don't even think he has those parties anymore. And my job still pretty much trashes my social life, so if there was a party anywhere tonight, I probably could not go and enjoy myself much anyway.