how do the guest at the party "conduct themselves"?

Fitzgerald gives great attention to the details of contemporary society: Gatsby's party is both a description and parody of Jazz Age decadence. It exemplifies the spirit of conspicuous consumption, and is a queer mix of the lewd and the respectable. Though catered to by butlers and serenaded by professionally trained singers, the guests are drunk, crude, and boisterous. The orchestra plays a work by Tostoff called The Jazz History of the World; though it had had a fantastic reception at Carnegie Hall, the piece is the antithesis of classical respectability.