| 93568 | August 18 | Event | 1917 – A Great Fire in Thessaloniki, Greece destroys 32% of the city leaving 70,000 individuals homeless. |
| 93569 | August 18 | Event | 1920 – The Nineteenth Amendment to the United States Constitution is ratified, guaranteeing women's suffrage. |
| 93570 | August 18 | Event | 1938 – The Thousand Islands Bridge, connecting New York, United States with Ontario, Canada over the Saint Lawrence River, is dedicated by U.S. President Franklin D. Roosevelt. |
| 93541 | August 17 | Holiday and observance | Birthday of Marcus Garvey (Rastafari) |
| 93542 | August 17 | Holiday and observance | Christian feast day:Clare of the CrossHyacinth of PolandJacobo Kyushei TomonagaJeanne DelanoueJohann Gerhard (Lutheran)Mammes of Caesarea (Catholic Church)Samuel Johnson, Timothy Cutler, and Thomas Bradbury Chandler (Episcopal Church)August 17 (Eastern Or |
| 93543 | August 17 | Holiday and observance | Black Cat Appreciation Day |
| 93544 | August 17 | Holiday and observance | Engineer's Day (Colombia) |
| 93545 | August 17 | Holiday and observance | Flag Day (Bolivia) |
| 93546 | August 17 | Holiday and observance | Independence Day (Indonesia), celebrates the proclamation of Indonesia's independence from Japan in 1945. |
| 93547 | August 17 | Holiday and observance | Independence Days (Gabon), celebrates the independence of Gabon from France in 1960. |
| 93548 | August 17 | Holiday and observance | Prekmurje Union Day (Slovenia) |
| 93549 | August 17 | Holiday and observance | San Martin Day (Argentina) |
| 93550 | August 17 | Holiday and observance | Discovery Day 2015 in the Yukon Territory of Canada |
| 93551 | August 18 | Event | 684 – Battle of Marj Rahit: Umayyad partisans defeat the supporters of Ibn al-Zubayr and cement Umayyad control of Syria. |
| 93552 | August 18 | Event | 1304 – The Battle of Mons-en-Pévèle is fought to a draw between the French army and the Flemish militias. |
| 93553 | August 18 | Event | 1487 – The Siege of Málaga ends with the taking of the city by Castilian and Aragonese forces. |
| 93554 | August 18 | Event | 1572 – Marriage in Paris, France, of the Huguenot King Henry III of Navarre to Margaret of Valois, in a supposed attempt to reconcile Protestants and Catholics. |
| 93555 | August 18 | Event | 1587 – Virginia Dare, granddaughter of Governor John White of the Colony of Roanoke, becomes the first English child born in the Americas. |
| 93556 | August 18 | Event | 1590 – John White, the governor of the Roanoke Colony, returns from a supply trip to England and finds his settlement deserted. |
| 93557 | August 18 | Event | 1612 – The trial of the Pendle witches, one of England's most famous witch trials, begins at Lancaster Assizes. |
| 93558 | August 18 | Event | 1634 – Urbain Grandier, accused and convicted of sorcery, is burned alive in Loudun, France. |
| 93559 | August 18 | Event | 1783 – A huge fireball meteor is seen across Great Britain as it passes over the east coast. |
| 93560 | August 18 | Event | 1838 – The Wilkes Expedition, which would explore the Puget Sound and Antarctica, weighs anchor at Hampton Roads. |
| 93561 | August 18 | Event | 1848 – Camila O'Gorman and Ladislao Gutierrez are executed on the orders of Argentine dictator Juan Manuel de Rosas. |
| 93562 | August 18 | Event | 1864 – American Civil War: Battle of Globe Tavern: Union forces try to cut a vital Confederate supply-line into Petersburg, Virginia, by attacking the Wilmington and Weldon Railroad. |
| 93563 | August 18 | Event | 1868 – French astronomer Pierre Janssen discovers helium. |
| 93564 | August 18 | Event | 1870 – Franco-Prussian War: Battle of Gravelotte is fought. |
| 93565 | August 18 | Event | 1877 – Asaph Hall discovers Martian moon Phobos. |
| 93566 | August 18 | Event | 1891 – Major hurricane strikes Martinique, leaving 700 dead. |
| 93567 | August 18 | Event | 1903 – German engineer Karl Jatho allegedly flies his self-made, motored gliding airplane four months before the first flight of the Wright brothers. |