I just want to say thanks, first off, for the lovely, reasonable and sane advice. It was really comforting to know that I wasn't a total meanie for not feeling some sort of holiday spirit benevolence that made me want to invite Louis.
Since last week?
I invited Best Friend to the party. She hasn't answered one way or the other, but we're still a month out, so the same is true of more than half of our invitees. (We've already got a solid 50 guests!)
Claire saw Louis at a party last week and said he was weirdly and aggressively friendly. "Talked my ear off" was the exact wording she used. Which is not in line with how they'd usually interact at ALL. Then another friend, who is a fellow board member, saw him at an event this past weekend and said that he approached her and started chatting away like nothing had happened. She was one of the people graced with an individual communication when she tried (very gently, I might add) to ask him to please step back from the situation when he decided he wanted to rejoin the group a month ago, so it was especially weird. She politely disengaged and avoided him for the rest of the evening. He's also been almost frenetically interacting on Facebook--commenting on everything anyone posts (he unfriended but did not block so I can see it on mutual friend's posts), offering random advice and help, lavishly complimenting people on anything they mention having done (including ME, via something my boyfriend posted).
The board meeting for elections was last night. Best Friend nominated him from the floor, then when several people protested, she said she'd just step aside and become a non-officer board member and he could have her place. Because there were several people absent and one person abstained from the vote in protest, he only needed 5 votes to win, which he got--Spouse, Best Friend, a member who is connected to one of them professionally, and the elderly ladies that I call The Sustainers who I don't think even have email so were completely unaware of any conflict since we were all very polite and circumspect about the whole thing.
So, now we're all in a weird place. We're gonna have to see him ALL THE TIME and I know that he's angling for an invite since he glommed onto Claire at the other party and approached the other friend last weekend. At this point, I think that he definitely knows about the party via Best Friend and I feel sure that he's going to show up either way. Oh, well, it is what it is. I know that everyone else involved knows how to act properly in a social situation so if he show's up, anything that goes badly is on him.
I'll update y'all after the party.
ETA: He claims that all of the bad behavior was because of a poor reaction to a new medication and as such he doesn't remember anything he did and since he deleted the emails he can't go back and check. Because, I guess for some reason, he can't ask his best friend or spouse who witnessed the whole thing.