Okinawa Memorial Day
Okinawa Memorial Day is held on June 23. 慰霊の日 or Irei no Hi, lit. "the day to console the dead" - Okinawa Prefecture, Japan. This event in the third decade of the month June is annual. 
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At the end of the Pacific War, a ground war involving civilians killed about 200,000 Japanese and US troops and civilians in Okinawa. June 23, when the organized battle of the Japanese army is said to have ended, is designated as "Okinawa Memorial Day" by Okinawa Prefecture and is designated as a holiday. The "Okinawa National Memorial Service for War Dead" is held every year at the Peace Memorial Park in Mabuni, Itoman City.
Similar holidays and events, festivals and interesting facts
Waterloo Day on June 18 (United Kingdom. The date of the Battle of Waterloo, in 1815);
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Army Day or Battle of Carabobo Day in Venezuela on June 24
Bannockburn Day on June 24 (Scotland. The Battle of Bannockburn 24 June 1314 was a significant Scottish victory in the First War of Scottish Independence, and a landmark in Scottish history. Stirling Castle, a Scots royal fortress, occupied by the English, was under siege by the Scottish army);
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Wine Battle Memorial Day on June 29 (Venezuela, Colombia, Costa Rica, Malta, Peru, Rome Italy, Sao Paulo, Chile, Spain)