On June 18 Waterloo Day is held. United Kingdom. The date of the Battle of Waterloo, in 1815. This june event in the second decade of the month is annual.
Okinawa Memorial Day on June 23 (慰霊の日 or Irei no Hi, lit. "the day to console the dead" - Okinawa Prefecture, Japan);
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);
Armed Forces Day in United Kingdom on June 27 (and National Veterans' Day);
Wine Battle Memorial Day on June 29 (Venezuela, Colombia, Costa Rica, Malta, Peru, Rome Italy, Sao Paulo, Chile, Spain)