# List of occasions known by their dates

This is a list of occasions, such as holidays and events, named after or commonly referred to by the calendar day on which they fall.

## Holidays

| Date | Name | Other names | Observed in | Description |
| March 15 | Ides of March | — | Ancient Rome | Day noted for various religious festivities, and the anniversary of Julius Caesar's assassination. |
| April 1 | April Fool's Day | — | Worldwide | Observance known for hoaxes and pranks. |
| April 20 | 420 | — | Worldwide | An informal observance celebrating the recreational use of cannabis. |
| May 1 | May Day | International Workers' Day | Worldwide | Ancient spring festival and labor celebration commemorating the eight-hour day. |
| May 5 | Cinco de Mayo | — | United States, Puebla, Mexico | Spanish for "fifth of May." Commemorates the Mexican army's victory over French forces at the Battle of Puebla on May 5, 1862. |
| May 9 | 9 May | Victory Day | Russia, Israel, and many other nations | Marks the capitulation of Nazi Germany to the Soviet Union in World War II on 8 May 1945. |
| May 24 | May Two-Four | Victoria Day (French: Fête de la Reine) | Canada | Celebrates the birthday of Queen Victoria and the current reigning Canadian Monarch. Observed on the last Monday preceding May 25. |
| June 19 | Juneteenth | Emancipation Day | United States | Commemorates the end of slavery in Texas as a result of the Emancipation Proclamation. |
| July 4 | Fourth of July | Independence Day | United States | Commemorates the United States' adoption of the Declaration of Independence on July 4, 1776. |
| ט׳ באב‎ | The Ninth of Av | Tisha B'Av | Israel, and by Jews worldwide | An annual fast day in Judaism which commemorates the anniversary of a number of disasters in Jewish history. |
| (see description) | Double Ninth Festival | Chung Yeung Festival | China, Vietnam, Korea | A traditional Chinese holiday observed on the 9th day of the 9th month in the Chinese calendar. |
| October 10 | Double Ten Day | National Celebration Day | Republic of China (Taiwan) | National day of Taiwan, commemorating the start of the Wuchang Uprising on October 10, 1911. |
| November 5 | Fifth of November | Guy Fawkes Night | England, some Commonwealth nations | Commemorates the arrest of Gunpowder Plot conspirator Guy Fawkes on 5 November 1605. |

## Historical events

| Date | Name | Other names | Description |
| June 1, 1794 | Glorious First of June | Third Battle of Ushant | A naval battle between the Great Britain and France during the French Revolutionary Wars. |
| March 31, 1909 | 31 March Incident | — | Political crisis within the Ottoman Empire in April 1909, during the Second Constitutional Era. |
| March 1, 1919 | March 1st Movement | — | Korean independence movement. |
| May 4, 1919 | May Fourth Movement | — | Chinese sociopolitical movement originating from protests that occurred on May 4, 1919. |
| May 30, 1925 | May Thirtieth Movement | — | Major labor and anti-imperialist movement during the middle-period of the Republic of China era. |
| April 12, 1927 | Shanghai massacre | April 12 Incident | Violent suppression of Chinese Communist Party organizations and leftist elements in Shanghai by forces supporting General Chiang Kai-shek and conservative factions in the Kuomintang. |
| January 28, 1932 | January 28 incident | — | Conflict between the Republic of China and the Empire of Japan. |
| May 15, 1932 | May 15 incident | — | Attempted coup d'état in the Empire of Japan. |
| December 9, 1935 | December 9th Movement | — | Mass protest led by students in Beiping to demand that the Chinese government actively resist Japanese aggression. |
| February 26, 1936 | February 26 incident | 2/26 | Attempted coup d'état in the Empire of Japan. |
| July 7, 1937 | Marco Polo Bridge Incident | July 7 Incident | Battle during July 1937 in the district of Beijing between China's National Revolutionary Army and the Imperial Japanese Army. |
| December 7, 1941 | Pearl Harbor Day | — | US base at Pearl Harbor attacked by Japan, leading US to enter WWII. |
| July 20, 1944 | 20 July plot | — | Attempted assassination of Adolf Hitler. |
| February 28, 1948 | February 28 incident | — | Anti-government uprising in Taiwan that was violently suppressed by the Kuomintang–led nationalist government of the Republic of China. |
| October 17, 1952 | 17 October affair | — | Event during which Indonesian soldiers pressured the president to disband the Provisional People's Representative Council. |
| September 30, 1965 | 30 September Movement | — | Self-proclaimed organization of Indonesian National Armed Forces members who, in the early hours of 1 October 1965, assassinated six Indonesian Army generals in an abortive coup d'état. |
| May 13, 1969 | 13 May incident | — | Episode of Sino-Malay sectarian violence that took place in Kuala Lumpur, the capital of Malaysia. |
| April 19, 1970 | 19th of April Movement | — | Colombian urban guerrilla movement active in the late 1970s and 1980s, named after 1970 Colombian general election. |
| November 20, 1936 and 1975 | 20-N | — | Deaths of José Antonio Primo de Rivera, Falange Española, and Francisco Franco. |
| June 4, 1989 | 1989 Tiananmen Square protests and massacre | June Fourth Incident | Chinese pro-democracy protests that ended in a violent government crackdown |
| April 19, 1995 | Oklahoma City bombing | — | A car bomb attack in the Alfred P. Murrah Federal Building, and remains the deadliest act of domestic terrorism in U.S. history. |
| September 11, 2001 | September 11th | 9/11 | Four coordinated suicide attacks by plane hijacking upon the United States by Islamist militant group al-Qaeda. |
| March 11, 2004 | 2004 Madrid train bombings | 11M | Series of coordinated, nearly simultaneous bombings against the Cercanías commuter train system of Madrid, Spain. |
| July 7, 2005 | 7 July 2005 London bombings | 7/7 | Series of four coordinated suicide attacks carried out by Islamic terrorists in London that targeted commuters travelling on the city's public transport system. |
| August 29, 2005 | Hurricane Katrina | — | Category 5 hurricane that made landfall along the Gulf Coast, causing a least a thousand deaths and the levee failures in New Orleans. |
| March 23, 2009 | March 23 Movement | M23 | Rebel military group that is for the most part formed of ethnic Tutsi, based in eastern areas of the Democratic Republic of the Congo. |
| March 11, 2011 | 2011 Tōhoku earthquake and tsunami | 3/11 | Earthquake and tsunami in the Tōhoku region of Japan. |
| July 22, 2011 | 2011 Norway attacks | 22. juli | A car bomb attack on Regjeringskvartalet in Oslo, Norway, followed by a shooting massacre on Utøya. |
| January 20, 2017 | DisruptJ20 | — | An organization that protested and attempted to disrupt events of the presidential inauguration of the 45th U.S. President, Donald Trump. |
| January 6, 2021 | January 6 United States Capitol attack | January 6th | Attack on the United States Capitol by supporters of President Trump to prevent the counting of electoral college votes from the recent presidential election. |
| October 7, 2023 | 2023 Hamas-led attack on Israel | October 7 | |