The Democratic establishment descended on the Hamptons this weekend for something of a political royal wedding that brought together the worlds of big-money politics and Clinton-era insiders.

The newlyweds were Alex Soros, the son of George Soros, the Democratic Party’s most generous patron, and Huma Abedin, a political aide who has been described as almost a daughter to Hillary Clinton, the former first lady and secretary of state. Held on Saturday at a Soros family estate in Water Mill, N.Y., the wedding drew private jets and Clinton aides galore in a rare concentration of wealth and power.

Beyond the couple’s families, the guest list included Mrs. Clinton and her husband, former President Bill Clinton; former Vice President Kamala Harris and her husband, Doug Emhoff; Senator Chuck Schumer of New York, the minority leader; former Speaker Nancy Pelosi; celebrities like Nicky Hilton Rothschild; cultural figures like the Vogue editor Anna Wintour; longtime Clinton friends like the San Francisco power broker Susie Tompkins Buell; and foreign dignitaries like the prime minister of Albania, Edi Rama.

The starry lineup was described by four people who were at the wedding as well as several representatives for the attendees. Representatives for the couple did not immediately respond to requests for comment.

The vocal group Boyz II Men performed at the wedding, according to two of the attendees, and speakers giving toasts included Mr. Soros’s brother Jonathan, Mrs. Clinton, Ms. Wintour and Mr. Rama. Dishes included truffle agnolotti, chilled English pea soup and an American Wagyu bavette and grilled prawns.