Atreus was there! He brought Lance, he didn't go very formal cause he wasn't told to wear a suit so he figured it was fine.
EARLY ON he definitely picked up the Loki first, so please feel free to have noticed that! There was an awkward moment and he like, looked down at it and the name and then looked at the rest and the picked up Atreus and tried to put Loki down like totes didn't just go for that one first heyyyyyyy. Finger guns. He would have ultimately made a dent in most of the wines because he needed it and also dragged Lance off to a corner at some point.