One reason the Met Gala after-parties are nearly as famous as the Met Gala itself has to do with an incident that took place 10 years ago at the Standard Hotel in the West Village of Manhattan.

On that night, Beyoncé was a star of the red carpet at the Metropolitan Museum of Art, along with her husband, Jay-Z, and her sister Solange Knowles. Afterward, in an elevator car headed to the Boom Boom Room, the club on the top floor of the Standard, Solange attacked her brother-in-law while Beyoncé stood watching and a bodyguard tried to restore order. The security-cam footage leaked to TMZ and the internet, and a family fight became the stuff of New York social lore.

Things were less dramatic this year and less star studded at the annual Standard after-party. Just past midnight, the most famous person at Boom was the designer Christian Siriano, who had arrived with his date for the evening, the model Coca Rocha. Connie Fleming, the hotel’s longtime doorwoman, reflected on the changes in the social atmosphere since the heady days of 2014.

“I think the Met Gala has peaked in its base of being about real fashion and real fashion people,” said Ms. Fleming, who became one of the trans community’s first stars in the 1990s, when she walked runways for Thierry Mugler.