World Circus Day
World Circus Day is held on April 19. On the third Saturday of April. This event in the second decade of the month April is annual. 
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Celebrated on the third Saturday each April, World Circus Day is a special day to celebrate Circus Arts and Culture.
Similar holidays and events, festivals and interesting facts
World Amateur Radio Day on April 18 (Every April 18, radio amateurs worldwide take to the airwaves in celebration of World Amateur Radio Day. It was on that day in 1925 that the International Amateur Radio Union was formed in Paris);
World Trifle Day on April 18
World Bicycle Day on April 19 (The events of the first LSD trip in April 19, 1943, now known as “Bicycle Day”, after the bicycle ride home, proved to Hofmann that he had indeed made a significant discovery: a psychoactive substance with extraordinary potency, capable of causing significant shifts of consciousness in incredibly low doses);
International Cat Lady Day on April 19
UN Chinese Language Day on April 20 (United Nations);
International Milk Tea Dumpling Day on April 20 (social media user initiative, 2019);
World Fish Migration Day on April 21