Arbor Day in China
Arbor Day in China is held on March 12. This event in the second decade of the month March is annual. 
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Arbor Day, much like Earth Day, is a holiday that celebrates nature. Its purpose is to encourage people to plant trees, and many communities traditionally take the opportunity to organize tree-planting and litter-collecting events on or around the holiday.
In China, Arbor Day is a public holiday on celebrated on March 12. The date was chosen to commemorate the passing of Dr. Sun Yat-sen, known as the father of modern China, in 1925. Sun Yat-sen (12 November 1866 – 12 March 1925) was a Chinese statesman, physician, and political philosopher, who served as the first provisional president of the Republic of China and the first leader of the Kuomintang (Nationalist Party of China).
Similar holidays and events, festivals and interesting facts
World Day of Prayer on March 6
White Day in Japan on March 14 (also South Korea, Vietnam, Taiwan, Hong Kong, Malaysia and China on March 14, one month after Valentine's Day - ホワイトデ);
China Flower Festival on March 15
Serfs Emancipation Day in Tibet on March 28 (Day of the liberation of Tibetans from serfdom in China, Tibet);
National Coffee Day in China on April 1
World Party Day on April 3
International Aircraft Carrier Day on April 3