Birthday of HRH Crown Prince is a cultural holiday celebrated in Tonga on September 17th. This day is observed to honor the birthday of the heir to the throne. The people of Tonga celebrate this day with traditional dances, feasts, and other cultural activities. The holiday is a time for the people of Tonga to come together and celebrate their culture and heritage. It is a day of national pride and unity, and it is an important part of Tongan culture.