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
Pavarana and Wan Ok Phansa in Thailand on September 25 (Full moon, 11th Thai lunar month);
Mid-Autumn Festival or Moon Festival or Mooncake Festival on September 25 (15th day, 8th Chinese lunar month);
King Rama IV Memorial Day in Thailand on October 1
Sat Thai Day on October 10
Vegetarian Festival in Thailand on October 10 (1st–9th days, 9th Chinese lunar month);
King Bhumibol Adulyadej Memorial Day in Thailand on October 13
Democracy Day in Thailand on October 14