Final answer:
Jay Gatsby spends most of his party alone and does not mind uninvited guests because his parties are a means to impress Daisy Buchanan, and the turnout, invited or not, contributes to his desired image of success and popularity.
Step-by-step explanation:
In F. Scott Fitzgerald's The Great Gatsby, Jay Gatsby spends most of his party alone and does not appear troubled by the presence of uninvited guests due to specific and complex motives and significances that underpin his character. One aspect of his solitary behavior during these parties is the fact that Gatsby's actions are not necessarily intended to represent a broad commentary on the wealthy or their lifestyles during the 1920s. Instead, they reflect his own unique story and experiences, as Fitzgerald portrays him through a single, flawed narrator, and allows readers to interpret his actions in a way that resonates with them on a more personal level. Additionally, Gatsby's indifference to uninvited guests reflects his ultimate desire: to impress Daisy Buchanan. His parties are a lure, a backdrop meant to attract Daisy and to create an aura of grandeur that he hopes will win her affection. His lack of mingling suggests that he's disinterested in the party itself; it's merely a means to an end. He doesn't mind the uninvited because having a large turnout, regardless of who attends, contributes to the image of success and popularity he aims to project.