Christmas Tree Day in Japan
Christmas Tree Day in Japan is held on December 7. This event in the first decade of the month December is annual. 
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This Christmas Tree Day commemorate Japan’s first decorated Christmas tree in public in Yokohama (1886).
Similar holidays and events, festivals and interesting facts
Motion Picture Day in Japan on December 1
Bodhi Day in Japan on December 8
Hari-Kuyō on December 8 (Kansai region, Japan);
Japan Kanji Day on December 12 (Kanji are Chinese characters used in modern Japanese writing along with hiragana, katakana, Arabic numerals, and romaji. On this day, the kanji of the year is chosen and announced at a special ceremony. It is selected by the Japan Kanji Professionals Society through the national ballot);
Forty-seven Ronin Remembrance Day in Sengaku-ji, Tokyo on December 14
Commemoration Day of 47 rōnin in Japan on December 14
World Otaku Day on December 15 (a person who is passionate about something)