Coronation Day in Thailand or Wan Chattra Mongkol
Coronation Day in Thailand or Wan Chattra Mongkol is held on May 4. This event in the first decade of the month May is annual. 
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Commemorates the coronation of King Maha Vajiralongkorn in 2019 and of his father, King Bhumibol Adulyadej, in 1950. Previously held on 5 May; cancelled in 2017 and re-established on 4 May in 2019 (beginning 2020).
Wan Chattra Mongkol (วันฉัตรมงคล) or Coronation Day is the anniversary of coronation of King Vajiralongkorn on 4th May, 2019.
Similar holidays and events, festivals and interesting facts
Consumer Protection Day in Thailand on April 30 (since 1980);
Wan Phra Ratcha Phithi Phuetcha Monkhon Lae Charot Phra Nangkhan Raek Na Khwan or Farmer's Day in Thailand on May 4 (Each year's date is astrologically determined and announced by the Bureau of the Royal Household);
Thai Buffalo Conservation Day on May 14 (Adopted 7 March 2017);
King Prajadhipok Day in Thailand on May 30
Queen Suthida's Birthday in Thailand on June 3
Pineapple Festival in Lampang Province, Thailand on June 6
World Naturist Day on June 7 (Starts on the first Sunday of June in the northern hemisphere and on the first Sunday of December in the southern hemisphere)
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