“I’m just happy Andrew didn’t ask to make a documentary about the Tribeca Film Festival,” said Robert DeNiro last night at the fest’s big opening night. Instead, Andrew Rossi, the director behind “Page One: Inside the New York Times” and “Ivory Tower,” chose to make “The First Monday in May,” a documentary about the Metropolitan Museum of Art’s Costume Institute and the annual Met Ball bash thrown by Anna Wintour and Vogue. Wintour was on hand to celebrate the premiere, wearing her signature sunglasses even in the darkened theater, where the likes of Karolina Kurkova, Wendi Deng, and Chloe Moretz sat. Unsurprisingly, Vogue‘s Editor-in-Chief is very much the star of the movie, delivering her clipped wit with a very large Starbucks in hand. In contrast, the scenes starring her counterpart Andrew Bolton, the curator of the Costume Institute, are less quippy and offer a more romantic look at fashion. It’s a dynamic that plays to the film’s theme of joining art and commerce—which is what the Met Ball does, at its most basic level. Last year it raised over $12 million for the museum, which might be why Andre Leon Talley called it “the Super Bowl of social fashion events.” Here, a look at everyone who came to relive the party vicariously.