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Wikipedia:Selected anniversaries/April 20

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This is a list of selected April 20 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.

Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.

To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.

April 19 April 21
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Ineligible

Blurb Reason
1303Pope Boniface VIII issued a bull establishing what is now Sapienza University of Rome, today one of the largest universities in Europe. refimprove section
1653Oliver Cromwell dissolved the Rump Parliament of the Commonwealth of England by force, eventually replacing it with the Barebone's Parliament. refimprove section
1792 – After Foreign Minister Charles François Dumouriez presented the French Legislative Assembly with a long list of grievances against Austria, France declared war to begin the French Revolutionary Wars. refimprove section
1862 – French chemist Louis Pasteur and physiologist Claude Bernard completed the first test on pasteurization. date not in article; Pasteur listed on Sept 28 (death date); fact not in Bernard article
1884Pope Leo XIII published the encyclical Humanum genus, denouncing Freemasonry as well as a number of beliefs and practices purportedly associated with it such as popular sovereignty and the separation of church and state. lots of assorted inline maintenance tags
1908The inaugural season of the New South Wales Rugby League premiership began with nine teams competing in Australia's first Rugby league football competition. Season: refimprove section; NSWRL: refimprove
1912Fenway Park in Boston, Massachusetts, and Tiger Stadium in Detroit, Michigan, were opened. Fenway: refimprove section
1998 – The violent German revolutionary group known as the Red Army Faction announced that it had dissolved. refimprove section

Eligible

April 20: First day of Ridván (Baháʼí Faith, 2024); 420 (cannabis culture)

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Vädersolstavlan
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