National holiday in Japan
National holiday in Japan is held on June 15. In honor of William Adams [1564-1620], also known as Anjin-sama - 三浦按針, was an English navigator, became a samurai. It is believed that he was the first Englishman to live in Japan. This event in the second decade of the month June is annual. 
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He apprenticed to a shipwright, and studied shipbuilding, astronomy, and navigation. William Adams joined the Royal Navy during Anglo-Spanish War. He served in the Royal Navy under Sir Francis Drake. He became a pilot for the Barbary Company, a trading company established by Queen Elizabeth I of England.
Similar holidays and events, festivals and interesting facts
World Juggling Day on June 14 (It will be held on the Saturday closest to June 17);
Sanno Festival in Japan on June 15 (June 10-16th - every even-numbered year. Kanda Festival - mid-May - every odd-numbered year);
Father's Day on June 15 (Ñelebrated on the third Sunday of June øò Argentina, Aruba, Canada, Costa Rica, France, Greece, Hong Kong, Hungary, India, Ireland, Kenya, Japan, Macao, Malaysia, Malta, Mexico, Netherlands, Pakistan, Peru, Puerto Rico, Singapore, Slovakia, South Africa, Sri Lanka, Trinidad and Tobago, Turkey, Venezuela, United Kingdom);
Okinawa Memorial Day on June 23 (慰霊の日 or Irei no Hi, lit. "the day to console the dead" - Okinawa Prefecture, Japan);
Japanese Pear Day on July 4 (梨のこんにちは);
Tanabata in Japan on July 7 (たなばた or 七夕, meaning "Evening of the seventh");
Portfolio Day in July on July 8
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