Thai National Flag Day
Thai National Flag Day is held on September 28. This event in the third decade of the month September is annual. 
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Adopted 20 September 2016. King Vajiravudh officially gave sanction to the current flag of Thailand in 1917.
Similar holidays and events, festivals and interesting facts
Mahidol Day in Thailand on September 24
King Rama IV Memorial Day in Thailand on October 1
Vegetarian Festival in Thailand on October 1 (Date for 2024. 1st–9th days, 9th Chinese lunar month);
Sat Thai Day on October 2
King Bhumibol Adulyadej Memorial Day in Thailand on October 13
Democracy Day in Thailand on October 14
National Police Day or Wan Tamruat in Thailand on October 17