Unlike the typical red carpets, the Met Gala has an annual theme that coincides with a fashion-centric exhibition and A-list attendees on the hyper-strict guestlist are encouraged to dress accordingly. In explaining the theme, Costume Institute curator Andrew Bolton told the Times, "Whether it's pop camp, queer camp, high camp or political camp - Trump is a very camp figure - I think it's very timely".
In 1972 Vogue editor-in-chief Diana Vreeland took over and morphed it into a more celebrity-oriented affair with guests Andy Warhol, Diana Ross and Cher fraternizing with the high society of NY.
The ball is set to take place at the renowned New York City museum on Monday, May 6.
Camp is often over-the-top, with Sondag presenting "Swan Lake", Tiffany Lamps, King Kong and Art Nouveau as examples.
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Whether or not Rihanna will be at tonight's gala, a look back at her Met looks proves she will still be the queen to beat when it comes to interpreting Met Gala fashion in the most effortless but stunning way.
Want a seat? They go for $35,000 a piece.
Anna Wintour has revealed that Meghan Markle and Kate Middleton are her "dream" Met Gala guests.
Giuliana Rancic, stylist Brad Goreski and Teen Vogue's former Editor-in-Chief Elaine Welteroth will host the network's Live From the Red Carpet: The 2019 Met Gala from 30 Rock, while Zuri Hall will cover the red carpet, giving fans their first glimpses of all the glamour of the night as celebrities make their way to the gala.
Some of the items in the exhibition might best explain the theme: the "swan dress" worn by Bjork to the Oscars, a glittering costume worn by flamboyant USA singer Liberace, a shower head necklace designed by the late Karl Lagerfeld for Chloe in the 1980s.
The exhibition "Camp: Notes on Fashion" - a play on the title of Sontag's essay - formally opens at the Met on Thursday and runs through September 8.