Yes, Harmony of the Seas typically hosts one to two formal nights (now often referred to as "Dress Your Best" nights) during a standard seven-night Caribbean sailing. In 2026, Royal Caribbean continues to offer these as an opportunity for guests to wear black-tie attire, such as suits, ties, tuxedos, cocktail dresses, or evening gowns. While the main dining room enforces this dress code for those wishing to participate, it is not mandatory for the entire ship; casual dining options like the Windjammer remains available for those preferring a relaxed atmosphere. The exact number of formal nights is at the ship's discretion and is best verified via the Royal Caribbean App or the "Cruise Compass" newsletter once onboard, as it can vary based on the specific itinerary and length of the cruise.