I actually don't mind playing Cassie, if you wanted to do something with her! I had said that she hadn't made an appearance yet in the thread I've got going with Scott, but that could be because she's waiting until the end of the night to "surprise" him since he's not supposed to know she's there.
Scott and Loki sounds good, too, but you're right, I think Scott would make a point to excuse himself pretty soon into the conversation. They could have an awkward men's room confrontation?
AND. I don't know how you feel about this, but I'm pretty sure Scott would essentially be keeping an eye out for Clint all night. Probably swooped in when he was ready to leave and got him a cab, maybe snuck over to his apartment after the party to make sure he got home okay/got to bed. Unless someone else is taking that role, in which case, nevermind.