| 94801 | August 20 | Death | 2015 – Lina Morgan, Spanish actress and singer (b. 1937) |
| 94802 | August 20 | Death | 2015 – Armin, Prince of Lippe (b. 1924) |
| 94803 | August 20 | Death | 2015 – Frank Wilkes, Australian soldier and politician (b. 1922) |
| 94804 | August 20 | Holiday and observance | Christian feast day:Bernard of ClairvauxBlessed Georg HäfnerMaria De MattiasOswine of DeiraPhilibert of JumiègesWilliam and Catherine BoothAugust 20 (Eastern Orthodox liturgics) |
| 94805 | August 20 | Holiday and observance | Feast of Asmá’ (Bahá'í Faith) |
| 94806 | August 20 | Holiday and observance | Indian Akshay Urja Day (India) |
| 94807 | August 20 | Holiday and observance | Restoration of Independence Day, re-declaration of the independence of Estonia from the Soviet Union in 1991. |
| 94808 | August 20 | Holiday and observance | Revolution of the King and People (Morocco) |
| 94809 | August 20 | Holiday and observance | Saint Stephen's Day (Hungary) |
| 94810 | August 20 | Holiday and observance | World Mosquito Day (International) |
| 94811 | August 21 | Event | 1140 – Song dynasty general Yue Fei defeats an army led by Jin dynasty general Wanyan Wuzhu at the Battle of Yancheng during the Jin–Song Wars. |
| 94812 | August 21 | Event | 1192 – Minamoto no Yoritomo becomes Seii Tai Shōgun and the de facto ruler of Japan. (Traditional Japanese date: July 12, 1192) |
| 94813 | August 21 | Event | 1331 – King Stefan Uroš III, after months of anarchy, surrenders to his son and rival Stefan Dušan, who succeeds as King of Serbia. |
| 94814 | August 21 | Event | 1680 – Pueblo Indians capture Santa Fe from the Spanish during the Pueblo Revolt. |
| 94815 | August 21 | Event | 1689 – The Battle of Dunkeld in Scotland. |
| 94816 | August 21 | Event | 1770 – James Cook formally claims eastern Australia for Great Britain, naming it New South Wales. |
| 94817 | August 21 | Event | 1772 – King Gustav III completes his coup d'état by adopting a new Constitution, ending half a century of parliamentary rule in Sweden and installing himself as an enlightened despot. |
| 94818 | August 21 | Event | 1778 – American Revolutionary War: British forces begin besieging the French outpost at Pondichéry. |
| 94819 | August 21 | Event | 1808 – Battle of Vimeiro: British and Portuguese forces led by General Arthur Wellesley defeat French force under Major-General Jean-Andoche Junot near the village of Vimeiro, Portugal, the first Anglo-Portuguese victory of the Peninsular War. |
| 94820 | August 21 | Event | 1810 – Jean-Baptiste Bernadotte, Marshal of France, is elected Crown Prince of Sweden by the Swedish Riksdag of the Estates. |
| 94821 | August 21 | Event | 1821 – Jarvis Island is discovered by the crew of the ship, Eliza Frances. |
| 94822 | August 21 | Event | 1831 – Nat Turner leads black slaves and free blacks in a rebellion in Southampton County, Virginia. |
| 94823 | August 21 | Event | 1852 – Tlingit Indians destroy Fort Selkirk, Yukon Territory. |
| 94824 | August 21 | Event | 1863 – Lawrence, Kansas is destroyed by Confederate guerrillas Quantrill's Raiders in the Lawrence Massacre. |
| 94825 | August 21 | Event | 1879 – The Virgin Mary, along with St. Joseph and St. John the Evangelist, reportedly appears at Knock Shrine in Knock, County Mayo, Ireland. |
| 94826 | August 21 | Event | 1883 – An F5 tornado strikes Rochester, Minnesota, leading to the creation of the Mayo Clinic. |
| 94827 | August 21 | Event | 1888 – The first successful adding machine in the United States is patented by William Seward Burroughs. |
| 94828 | August 21 | Event | 1897 – Oldsmobile, a brand of American automobiles, is founded. |
| 94829 | August 21 | Event | 1901 – The International Secretariat of National Trade Union Centres is founded in Copenhagen. |
| 94830 | August 21 | Event | 1911 – The Mona Lisa is stolen by a Louvre employee. |