World Immunization Week
World Immunization Week is held on April 24. This event in the third decade of the month April is annual. 
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World Immunization Week – celebrated in the last week of April (24 to 30 April) – aims to promote the use of vaccines to protect people of all ages against disease. Immunization saves millions of lives every year and is widely recognized as one of the world’s most successful and cost-effective health interventions.
Similar holidays and events, festivals and interesting facts
International Pixel-Stained Technopeasant Day on April 23
UN English Language Day on April 23 (United Nations);
UN Spanish Language Day on April 23 (United Nations);
International Nose Picking Day on April 23
Health Statistician's Day in Peru 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
International Guide Dog Day on April 24 (Last Wednesday in April);
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 Against Meningitis on April 24
African Vaccination Week on April 24
World Penguin Day on April 25
International Girls in ICT Day on April 25 (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 Delegate’s Day on April 25 (A/RES/73/286)