How does nick characterize the guest at Gatsby's party? What does his characterizations tell us about how Nick feels about most of these people? What sense of life in the Jazz Age do we get from the description of this party?

Nick becomes an observer rather than an active participant in the party. He is repulsed by the shallow superficiality of the guests attending the party. The people present have no other interest other than money and the illusion of happiness rather than happiness itself. The Jazz age, at least for the filthy rich, is a world of consumption and flat characters.