If you check P&O's website It states on Celebration Night and Black Tie night the following dress code applies. Celebration Nights give you the option to put your most fashionable foot forward. Elegance is the order of the evening… a chance to wow everyone with a favourite cocktail dress, tuxedo, ball gown, DJ, or a suit, jacket and tie. You may also wear formal national dress or military uniform. Again, whatever style preference, simply join in the mood and chic of the evening. Iona
Main Dining Restaurant, The Crow's Nest, Opal, Pearl, Coral, Aqua, The Epicurian, The Chef's table and Sindhu restaurant