The Met Gala is fashion's biggest night - and best-kept secret. The Metropolitan Museum of Art in New York City holds its annual fundraiser for the Costume Institute exhibit on the first Monday in May, inviting an elite list of guests to ascend the famed staircase for an elaborate dinner. Still, details about what goes on inside the benefit are unknown given its infamous no-phone policy. Each Met Gala follows a certain theme, which event designer Raúl Ávila and his team work tirelessly to bring to life inside the museum.