In the opulent, gilded world of 1970s New York high society, a single invitation can define a life. "Party of the Century" follows three young outsiders—ambitious photographer Leo (Jack O'Connell), enigmatic socialite heiress Fiona (Chloe Moretz), and their cunning, resourceful friend Benny (Josh Gad)—as they conspire to infiltrate the era's most exclusive and infamous costume ball. Directed by Robert Pulcini and Shari Springer Berman, this stylish drama captures the trio's desperate gamble to secure their futures, weaving a web of deception amidst a whirlwind of decadent fashion and ruthless ambition. As the night of the extravagant masquerade arrives, their carefully constructed plans begin to unravel, forcing each to confront the true cost of the privilege they so desperately crave. The film immerses viewers in a seductive yet cutthroat atmosphere where identities are as fluid as the champagne, exploring whether friendship and integrity can survive the ultimate test of social climbing.