What is the common denominator of all the stories about the people who meet at gatsby's parties?

The common denominator in stories about people who meet at Gatsby's parties is the aura of extravagance, glamour, and decadence that defines the parties. The characters are drawn to the allure of wealth and opulence, which often leads to themes of social status, desire, disillusionment, and the pursuit of the American Dream. Through these gatherings, F. Scott Fitzgerald explores the themes of superficiality and the emptiness of materialism.