Lou's there, doing his lil professor thing; he thinks he's just gonna pop in and show his face to be polite before scurrying away, but then it turns into an engagement party and then he HAS to stay and mingle.

Lou gets a little weepy about the proposal, both because he is a hopeless romantic and because it brings back bad memories of when he got engaged way back in the dinosaur days. He'll be very complimentary about the theme though, and wish them all the best!