Read about history and pick out a good one!
https://en.wikipedia.org/wiki/August_18
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.
1868 – French astronomer Pierre Janssen discovers helium.
1963 – Civil rights movement: James Meredith becomes the first African American to graduate from the University of Mississippi.
1983 – Hurricane Alicia hits the Texas coast, killing 21 people and causing over US$1 billion in damage (1983 dollars).