Every September 17, the Kingdom of Tonga observes the birthday of Crown Prince Tupoutoʻa ʻUlukalala as an official public holiday. Crown Prince Tupoutoʻa, born on September 12, 1985, became the heir apparent to the throne in March 2012 when his father ascended as King Tupou VI. His birthday is widely celebrated across Tonga, reflecting the significance of the monarchy in Tongan culture. The celebration includes various public festivities, and if September 17 falls on a Sunday, the following Monday is designated as a non-working public holiday. The Crown Prince's marriage to Sinaitakala Fakafanua in July 2012, which stirred controversy due to their close familial ties, adds to the public interest in his life.