Atreus was there with Lance! He got druuuuuuuuunk because that is Solstice tradition. Do you want to hear the story of everything that happened to them during Ragnarok but in DRUNK FORMAT? Now is the time. He stayed from sunset to sunrise and was chatty and outgoing.
Dream would have come by! He always looks the same and wears the same black clothes so there's that. If Kenzi wanted to hang with him he would have mentioned it but he's at least somewhat used to being around the god-types even if he doesn't drink. But he makes a very good wallflower.