Coronation Day in Thailand is observed every May 4, commemorating the coronation of King Rama X (Vajiralongkorn), which took place in 2019. This public holiday features a variety of festive events, including a military parade and fireworks display. The day marks the anniversary of the king's ascension to the throne, following a mourning period after the death of his father, King Bhumibol Adulyadej, in 2016. The formal coronation ceremony was postponed until late October 2017, after a year of mourning. The preparations for the coronation involved collecting water for purification from natural reservoirs across Thailand. Coronation Day serves as a significant occasion for national pride and celebration, reflecting the continuity of the Thai monarchy.