United Nations Day

United Nations Day is an annual commemorative day, reflecting the official creation of the United Nations on 24 October 1945. In 1947, the United Nations General Assembly declared 24 October, the anniversary of the Charter of the United Nations, as which "shall be devoted to making known to the people of the world the aims and achievements of the United Nations and to gaining their support for" its work.
In 1971, the United Nations General Assembly adopted a further resolution (United Nations Resolution 2782) declaring that United Nations Day shall be an international observance or international holiday and recommended that it should be observed as a public holiday by United Nations member states.
World War II Allies' day.
The first event called "United Nations Day" was a World War II Allies' day of solidarity and military parades launched by US President Franklin D. Roosevelt tied to US Flag Day on June 14, 1942, six months after the Declaration by United Nations. It was observed in New York City as the "New York at War" parade, in London, and by the Soviet and Chinese governments.
It was observed throughout World War II, during 1942–1944. Prior to the foundation of the UN itself, it was not directly connected to the current international observance.
Commemoration.
U.N. Day has traditionally been marked throughout the world with meetings, discussions and exhibits about the achievements and goals of the organization. In 1971, the General Assembly recommended that member states observe it as a public holiday.
Several international schools throughout India and other countries throughout the world would also celebrate the diversity of their student body on United Nations Day (although the event is not necessarily celebrated on 24 October). Celebrations often include a show of cultural performances in the evening and a food fair, where food is available from all over the world.
In the United States, the President has issued a proclamation each year for United Nations Day since 1948.
In Kosovo, United Nations Day is an official non-working day, as the province is administered by the Interim Administration Mission.
In the Philippines, local schoolchildren customarily dress in the national costumes of member states and hold a programme on U.N. Day, which is the last school day before semestral break. Individual students, classes, or grade levels are assigned a country to represent and study; students handcraft their assigned country's flag, and prepare cultural presentations and food as part of the day's educational activities.
History Commemorations.
On United Nations Day in 1951, the United Nations Postal Administration issued the first UN Stamps, which were issued in U.S. Dollars at the U.N. Headquarters in New York. 
World Development Information Day.
The UN's World Development Information Day has also been held on 24 October since 1972
Humanity has entered the era of sustainability – with a global commitment to fulfill the great promise of the 2030 Agenda for Sustainable Development. It is celebrated on 24 October worldwide. Many institutions celebrate it by conducting quizzes and elocutions. Da Potta Group of Companies in Kenya, Tanzania and India celebrate it with various discussions.