OOC
Tony didn't go overboard drinking, more like pleasantly buzzed and chatty while he made the rounds. He probably liked Yelena instantly, since she has a sarcastic streak and dry sense of humor like Nat has. Like Sam, he probably wanted to know embarrassing stories.
Dr. Strange popped in via portal to say hello, but he's no party animal. He's a workaholic, and disappeared quickly afterward.
Pete Wisdom is easily lured by booze. He's a spy who's done wet work too, so he probably asked about if a mission or two were Black Widow hits. Basic assassin shop talk.
Loki probably briefly snuck through wearing a nondescript illusion, just to steal a drink and some snacks for himself and Val, since they are in the Tower presently.
Safe bet that Remy winked at Yelena and introduced himself. He was friendly and a southern gentleman, and likes meeting new people. He kept the conversation polite, and disappeared like a thief in the night at some point.