International Day of United Nations Peacekeepers is celebrated on May 29, 2017. The "International Day of United Nations Peacekeepers" is "a day to pay tribute to all the men and women who have served and continue to serve in United Nations peacekeeping operations for their high level of professionalism, dedication, and courage and to honor the memory of those who have lost their lives in the cause of peace."
The day is marked at the United Nations Headquarters in New York City with the presentation of the Dag Hammarskj÷ld Medal, statements by the President of the General Assembly and the Secretary-General a press release regarding the state of UN Peacekeeping missions and the continued necessity of their work. There are also observances around the world, often countries will honor their own peacekeepers abroad, but the UN also organizes festivals, discussion forums, and memorials in cooperation with local and national groups.
Peacekeeping by the United Nations is a role held by the Department of Peacekeeping Operations as "a unique and dynamic instrument developed by the Organization as a way to help countries torn by conflict create the conditions for lasting peace". It is distinguished from both peacebuilding and peacemaking. (With material from: Wikipedia)