Though, this applies to regular parties/gatherings as well, not just That Kind[tm] of party (Richard's examples above notwithstanding). Someone has a history of abusing their partners? They aren't welcome at my house, period. Not for a wild rager of a party, not for a movie night, not a weekend bbq, not for anything really, other than possibly sitting down and talking about the things they are trying to do in their life to change past behavior.