The King Bhumibol Adulyadej Memorial Birthday or Father's Day in Thailand
The King Bhumibol Adulyadej Memorial Birthday or Father's Day in Thailand is held on December 5. Wan phor. This event in the first decade of the month December is annual. 
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Father's Day is a celebration that honours the role of fathers and forefathers.
King Bhumibol, wielded little real political power, although the constitution named him as head of state and commander of the armed forces. His most important function was to serve as a living symbol of and a focus of unity for the Thai nation. As monarch, Bhumibol enjoyed immense popularity. King Bhumibol's birthday has been honored in the past by festivals and candlelit events.
The day commemorates the birthday of the late King of Thailand, Bhumibol Adulyadej. It is also Thailand's National Day and is the day when Father's Day is celebrated in Thailand.
On National Father's Day, Thais honor their fathers and grandfathers by presenting them with a canna flower, which resembles a lily and is called 'dok phuttha raksa' in Thai.
Similar holidays and events, festivals and interesting facts
Grandparents Day in Singapore on November 24 (Fourth Sunday in November);
Father's day in Bulgaria on December 26
Global Family Day on January 1 (is grew out of the UN Millennium Day celebration, which included the distribution of the 1996 children's book One Day at a Time);
Father's Day in some Islamic countries on January 13 (Iran, Kuwait, Bahrain, Iraq, Oman, Qatar, Egypt, Yemen, Syria, Lebanon, Somalia, Sudan, Mauritania is celebrated on the 13th day of the month of Rajab);
Spouse's Day in Russia on January 19
Grandfather's Day in Poland on January 22
Grandchildren's Day in Ontario, Canada on February 7