World Bicycle Day
World Bicycle Day is held 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. This event in the second decade of the month April is annual. 
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There are over 1 billion bicycles currently being used all around the world. Cycling as a popular pastime and competitive sport was established during late 19th century in England. Bicycles save over 238 million gallons of gas every year. Smallest bicycle ever made has wheels of the size of silver dollars.
The term bicycle was coined in France in the 1860s, and the descriptive title "penny farthing", used to describe an "ordinary bicycle", is a 19th-century term. Known by many names, including the “velocipede,” “hobby-horse,” “draisine” and “running machine,” this early invention has made Drais widely acknowledged as the father of the bicycle. But the bicycle as we know it today evolved in the 19th century thanks to the work of several different inventors.
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
Pet Owners Independence Day on April 18
High Five Day on April 18
National Velociraptor Awareness Day in USA on April 18
World Circus Day on April 19 (On the third Saturday of April);
International Cat Lady Day on April 19
Auctioneers Day on April 19 (is one of the world’s most ancient professions, having begun more than 2,000 years ago. Third Saturday of April);
Garlic Day on April 19
Hanging Out Day on April 19
Poetry And The Creative Mind 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);
Look Alike Day on April 20
Record Store Day on April 20
Dancing Cow Day in Denmark on April 20 (On the third Sunday of April)