"Mamma Mia, let me go! We will be celebrating 'A Night At The Opera' and 50 Years of 'Bohemian Rhapsody,'" the band shared on Instagram, referring to their fourth studio album and the classic Queen track that appeared on it. "The dress code for party guests will be WHITE, to reflect the outfits the band wore at the time and the 'A Night At The Opera album' cover."