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Wikipedia:Selected anniversaries/August 20

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This is a list of selected August 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.

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Ineligible

Blurb Reason
Ghost Festival (Chinese calendar, 2013); refimprove
636Rashidun forces led by Khalid ibn al-Walid took control of Syria and Palestine in the Battle of the Yarmuk, marking the first great wave of Muslim conquests. Too much uncited, lots of verification needed tags
1794 – American troops defeated the Northwestern Confederacy, a Native American alliance, at the Battle of Fallen Timbers, the decisive battle of the Northwest Indian War. Too much uncited
1905Sun Yat-sen (pictured), Song Jiaoren, and others founded the Tongmenghui, a secret society dedicated to overthrowing the Qing dynasty of China. refimprove
1940 – In the midst of the Battle of Britain, British Prime Minister Winston Churchill delivered a speech thanking the Royal Air Force, declaring, "Never was so much owed by so many to so few." refimprove section
1944World War II: The Gestapo transported 168 Allied airmen, who had been classified as spies and criminals so as not to warrant prisoner of war treatment, to Buchenwald concentration camp. page numbers needed
1962NS Savannah, the first nuclear-powered cargo-passenger ship, made her maiden voyage. Overwhelmingly single sourced, several unsourced paragraphs
1971 – The Stanford prison experiment, one of the most infamous psychological studies, was ended after six days, when the simulation became too abusive. Tagged primary sources
1977NASA's Voyager 2 lifted off from Cape Canaveral in Florida, on a mission to explore the outer planets of the Solar System. unreferenced section
1882 – The 1812 Overture by Russian composer Pyotr Ilyich Tchaikovsky debuted in Moscow, conducted by Ippolit Al'tani. citations needed
1993Oslo Accords Moved to September 13
1998 – The Supreme Court of Canada delivered its decision in Reference Re Secession of Quebec, ruling that Quebec cannot legally secede from Canada without the federal government's approval. refimprove
Eadberht of Northumbria |d|768| date of death uncertain; might be 19th or 20th;[1]
Henry Every |b|1659| Too much uncited
Leona Helmsley |d|2007| Mulitple cn tags

Eligible

Notes

August 20

Pluto
Pluto
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