Ted wonders whether he should start hanging out with a new crowd after going to a high society architectural party. Meanwhile, Lily and Marshall discuss having children, and Barney worries that the gang is drifting apart.
While the flu ravages Pawnee, Andy and Leslie must book performers for the concert; Tom looks for a sommelier for his restaurant; Ben turns to Ron for help with a personal problem.
As Angel aids a nerdy billionaire out to retrieve some compromising photos, he encounters a group of young street kids defending their territory against invasion from a nest of vampires.
Everyone helps Joy's son plan the rehearsal dinner for his wedding; a guest from Joy's past shows up.
Oscar has to present his nemesis, Rich Eisen, with a humanitarian award; Felix goes through a range of emotions when he spots Emily at a restaurant.