UN English Language Day
UN English Language Day is held on April 23. United Nations. This event in the third decade of the month April is annual. 
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The English language is as fascinating as it is popular and obviously has its own history and quirks. Over 840 million people speak English as a first or second language, which makes it the second most-spoken language right after Mandarin.
Supercalifragilisticexpialidocious (*breath*) is NOT the longest word in English. Pneumonoultramicroscopicsilicovolcanoconiosis is a type of lung disease caused by inhaling ash and dust. Go ahead and try pronouncing that!
Similar holidays and events, festivals and interesting facts
International Girls in ICT Day on April 22 (aims to encourage and empower girls and young women to consider studies and car eers in the growing field of Information and communications technology);
UN Spanish Language Day on April 23 (United Nations);
International Pixel-Stained Technopeasant Day on April 23
International Nose Picking Day on April 23
World Labrador Day on April 23
International Day of Multilateralism and Diplomacy for Peace on April 24 (A/RES/73/127. Multilateralism, process of organizing relations between groups of three or more states);
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 Veterinary Day on April 24 (Last Saturday in April);
International TableTop Day on April 24 (Celebrate on the last Saturday of April);
World Immunization Week on April 24
International Day Against Meningitis on April 24
International Sculpture Day on April 24 (Held on the last Saturday of April);
International A cappella Week Hanover on April 24 (Begins on Saturday of the last full week of April)