Post Day in Japan
Post Day in Japan is held on April 20. This event in the second decade of the month April is annual. 
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Japan celebrates Post Day on April 20. The post office is taken very seriously in this country; for example, there is even an entire Japanese public conglomerate.
The Japan Post Holdings Company, Ltd. is a Japanese publicly traded conglomerate headquartered in Kasumigaseki, Chiyoda, Tokyo. It is mainly engaged in postal and logistics business, financial window business, banking business and life insurance business. The company offers letters and goods transportation services, stamp sales, deposits, loans, and insurance products.
Similar holidays and events, festivals and interesting facts
Invention Day in Japan on April 18
International Jugglers' Day on April 18
Game Designers' Day on April 27
Restoration of Sovereignty Day in Japan on April 28 (主権回復の日 Shuken kaifuku no hi - It marks the end of the American occupation of Japan on 28 April 1952);
Shōwa Day in Japan on April 29 (昭和の日 is celebrated in Japan to commemorate the birth date of Emperor Showa or Hirohito, the emperor of pre and post-World war II);
Constitution Memorial Day in Japan on May 3
Garbage Day in Japan on May 3 (Gomi No Hi)