Since everyone is talking about the dance party update, figured I'd chime in as well since there are a few things worth noting and maybe improving upon in future updates to this event.
First, when it comes to Anabel, I had to replay the party many times before the rng worked out in my favor of her not getting angry and leaving the sweet girls outright. The trick really is to avoid her altogether at the party otherwise Sammy seems hardcoded to give her alcohol no matter what (at least in my playthrough, but that might be a slut perk feature) and once that happens even one time there's no way to avoid her leaving. The problem was that sometimes she would appear in the room you go to and then thereby trigger receiving alcohol lol. So it was like a cat and mouse kind of scenario of avoiding her. She also would randomly end up with someone at the very end, sometimes even if you didn't give her anything. I even had a situation where Sammy said the party was winding down and then everyone was visible, so she didn't go look into any rooms for anyone, but then when you got to the street Anabel was suddenly missing anyway and Sammy made comments about her loosening up and being with guys even though that wasn't true. So yeah, all rng I guess, but just don't talk to her at all at the party if you can avoid it and that should help make her stay in the group at least in everything but for future parties. I'm not sure what the ultimate endgame is with her for future content, or if she will go back to the party event at some point. I hope there is more content with her in the future though.
For the Dani side of the party, I didn't notice any scenarios where she would leave as referenced in the devlog, but maybe that happens if she isn't already working at the pub. My Dani was, so I didn't see any issues with her at the party. The dialogue about her relationship with Anabel is the same no matter what, and whether they reconcile if Anabel stays with the girls or not, there's no change to Dani's dialogue about it after the fact. In school though, if Anabel didn't get stuck inside the party and got out with everyone, she'll stay friendly with Dani later on and you'll see them as a duo. There's not much additional dialogue between them from what I found based on the many times I reran the event and the days after.
I hope in the future that there is more content that you can easily access in the dance party. Someone suggested just having the bedrooms visible to go into and see if the girls are there. There's no Svetlana scenes that I could find (fingers crossed for some in the future), but there are random Rachel and Dani scenes you can run into, and even some rare group scenes with them. It's all rng though. For Sammy's scenes, she has to be propositioned and accept it, but that doesn't happen often I found unless you drink your own wine. She can't drink the wine at the party and has to drink wine she brings herself instead, just something to keep in mind.