International Day of Remembrance and Tribute to the Victims of Terrorism
International Day of Remembrance and Tribute to the Victims of Terrorism is held on August 21. Adopted by the UN on October 27, 2017. This event in the third decade of the month August is annual. 
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The General Assembly, in its resolution 72/165 (2017), established 21 August as the International Day of Remembrance of and Tribute to the Victims of Terrorism in order to honor and support the victims and survivors of terrorism and to promote and protect the full enjoyment of their human rights and fundamental freedoms.
By proclaiming an International Day dedicated to victims, the General Assembly reaffirmed that the promotion and the protection of human rights and the rule of law at the national; and international levels are essential for preventing and combating terrorism.
Similar holidays and events, festivals and interesting facts
San Martin Day in Argentina on August 19 (the third Monday of the month);
Ninoy Aquino Day in the Philippines on August 21
International Day of Remembrance for Victims of Violence Due to Religion or Belief on August 22 (International Day Commemorating the Victims of Acts of Violence Based on Religion or Belief - established since May 28, 2019 - UN A/RES/73/296);
Black Ribbon Day in Lithuania on August 23
Day of the Russian Germans on August 28
Tunisia Memorial Day on September 3
Merchant Navy Remembrance Day in Canada on September 3