Why does Fitzgerald shift 10th when describing the preparations and first arrivals for one of Gatsby and lsquos parties?

Fitzgerald shifts the narrative to the 10th because he wants to emphasize the grandeur and opulence of Gatsby's parties. By skipping past the initial preparations and focusing on the first arrivals, he can more effectively depict the extravagance and allure of the event. This technique helps build anticipation and sets the tone for the lavishness of the party.