Monday, October 24 is United Nations Day 2011. United Nations Day is a celebration of the 1945 ratification of the U.N. charter and the founding of the world body.

The U.N. Day concert is a traditional part of the celebration at U.N. headquarters in New York. This year's concert is dedicated to cultural diversity.

United Nations Day has been celebrated each October 24 since 1948.

In 1971, the U.N. General Assembly suggested that all member states make U.N. Day a public holiday.