International Day of Multilateralism and Diplomacy for Peace
International Day of Multilateralism and Diplomacy for Peace is held on April 24. A/RES/73/127. Multilateralism, process of organizing relations between groups of three or more states. This event in the third decade of the month April is annual. 
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In the event of a threat to the peace, multilateralism ensures the collective response of States. The principle of collective security is based on the multilateral approach. If one State is attacked, the others commit themselves to react. Multilateralism is also crucial for conflict prevention and resolution.
The genesis of modern multilateralism dates back to the 19th century. The Concert of Europe that emerged from the Vienna Congress in 1815 is considered a major step in its development.
Multilateralism is when at least three governments participate in a particular issue or to try to solve a problem. Multilateralism is an example of cooperation among world governments and used in contrast with unilateralism. Unilateralism is when a state acts without regard to the support or interests of other states.
In today's world marked by major geopolitical and economic power shifts, multilateralism is still the most effective means to govern global relations in a way that benefits all.
Similar holidays and events, festivals and interesting facts
UN English Language Day on April 23 (United Nations);
UN Spanish Language Day on April 23 (United Nations);
International Girls in ICT Day on April 23 (aims to encourage and empower girls and young women to consider studies and car eers in the growing field of Information and communications technology);
International Pixel-Stained Technopeasant Day on April 23
International Nose Picking Day on April 23
World Labrador Day on April 23
International Day of Youth Solidarity in the Struggle Against Colonialism, for a Peaceful Existence on April 24
International Day Against Vivisection on April 24
World Immunization Week on April 24
International Day Against Meningitis on April 24
International Delegate’s Day on April 25 (A/RES/73/286);
World Penguin Day on April 25
World Veterinary Day on April 25 (Last Saturday in April);
International TableTop Day on April 25 (Celebrate on the last Saturday of April);
International Sculpture Day on April 25 (Held on the last Saturday of April);
International A cappella Week Hanover on April 25 (Begins on Saturday of the last full week of April);
International Financial Independence Day on April 25