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
Pavarana and Wan Ok Phansa in Thailand on September 29 (Full moon, 11th Thai lunar month);
Mid-Autumn Festival or Moon Festival or Mooncake Festival on September 29 (15th day, 8th Chinese lunar month);
King Rama IV Memorial Day in Thailand on October 1
King Bhumibol Adulyadej Memorial Day in Thailand on October 13
Democracy Day in Thailand on October 14
Vegetarian Festival in Thailand on October 14 (Date for 2023. 1st–9th days, 9th Chinese lunar month)
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