International UN Day, October 24th

The name "United Nations", coined by the President of United States, Franklin D. Roosevelt, 
was first used in the "Declaration by United Nations" of 1 January 1942, during the WW2,
when representatives of 26 nations pledged their Governments to continue fighting
together against the Axis Powers.
States first established international organizations to cooperate on specific matters. 

The United Nations officially came into existence on 24 October 1945,
  when the Charter had been ratified by China, France, the Soviet Union, 
the United Kingdom, the United States and by a majority of other signatories.
United Nations Day is celebrated on 24 October each year.

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Dag Hammarsköld.
Dag Hammarsköld, 1905-61, became the secretary general of UN in April 1953.
He got killed in a plane accident on September the 17th in 1961 on
a peace mission in the war ravaged Republic, the Congo.

Hammarskjöld received the Nobel Peace-Prize shortly after his death in 1961
for his contributions to a better world. He showed the leaders of the world
what could be achieved by diplomatic actions.

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In 1998 my son John and his class were involved in a huge project, according
  the International UN Day, they worked for month before the big cooperative work
 in Stockholm, with  young people from all over the World, there were 
people from UN and other organizations.
If you are interested you can read about this project here
The project continues from year to year