The International Day of Multilateralism and Diplomacy for Peace has established on December 12, 2018, through a UN resolution and has first is being celebrated on April 24, 2019.
The International Day of Human Space Flight is being celebrated annually on April 12 to mark the anniversary of the first human space flight by Yuri Gagarin on April 12, 1961.
The International Children's Book Day (ICBD) is organized annually on the 2nd of April since 1967, by the International Board on Books for Young People (IBBY).
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