Read and learn about history. Pick out some good ones!
https://en.wikipedia.org/wiki/August_19
1848 – California Gold Rush: The New York Herald breaks the news to the East Coast of the United States of the gold rush in California (although the rush started in January).
1955 – In the Northeast United States, severe flooding caused by Hurricane Diane, claims 200 lives.
See more on Diane and hurricanes here:
https://www.marketforum.com/forum/topic/37086/