KamalaKhan showed up with Peter as her date. She was at Fight Club as a spectator but probably left early (I assume Nat, Carol, or Emmeline would have helped her with her makeup). She found anyone she knew and danced with them, generally had fun and also tried very hard to keep Peter sufficiently distracted and having fun too!
Fen showed up with Sophie because wherever there is a party with fancy ball gowns, she's there. And she mingled with literally everyone and complimented the hell out of Sophie probably because she's a shameless flirt.
Yelena Belova showed up on her own looking dazzling as hell and also mingled with everyone, taking the time to dance and ice skate and eat all the things.
My others are TBD or up to being taken in if anyone is interested.