Larry Gagosian is set to host “Art for Hillary Auction 2016” on September 12 at his 21st Street gallery space in West Chelsea, in a move that is a first for the art-world mogul.

According to ARTnews, the event is “not open to guests”. For the select few on the invite list, the night’s agenda includes a 6 p.m. reception for the host committee, artists, and attendees, followed by the auction from 7 to 9 p.m. Contributing artists, according to ARTnews, include “Jeff Koons, Sarah Sze, Chuck Close, Barbara Kruger, Elisabeth Kley, Joyce Pensato, Deborah Kass, and the identical-twin duo of Ryan and Trevor Oakes.”

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Gagosian is no stranger to political donations on both sides of the aisle. In the past, he has contributed to the campaigns of Republicans Mitt Romney and Chris Christie, as well as $1,000 to John Kerry’s 1996 campaign, according to New York Magazine, and $4,600 to Democratic senator Christopher Dodd in 2008.

Larry Gagosian. Courtesy of the Image Gate/Getty Images for Credit Suisse.

However, the Clinton event will be Gagosian’s first official fundraising event for a presidential nominee. The gallerist has been a fan of Clinton’s for years. In 2014, he reportedly contributed the maximum of $25,000 to the super PAC Ready for Hillary, along with Wal-Mart heiress and Crystal Bridges Museum of American Art founder Alice Walton.

While the Democratic presidential nominee will not be present at the September 12 event, her daughter Chelsea will be in attendance, reports ARTnews.

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artnet News reached out to the gallery and to Clinton’s team, but did not receive an immediate response.