Read about history and pick out a good one.
https://en.wikipedia.org/wiki/October_29
1929 – The New York Stock Exchange crashes in what will be called the Crash of '29 or "Black Tuesday", ending the Great Bull Market of the 1920s and beginning the Great Depression.
1998 – Hurricane Mitch, the second deadliest Atlantic hurricane in history, makes landfall in Honduras.
2015 – China announces the end of One-child policy after 35 years.
https://en.wikipedia.org/wiki/Wall_Street_Crash_of_1929
The Wall Street Crash of 1929, also known as the Stock Market Crash of 1929 or the Great Crash, was a major stock market crash that occurred in late October 1929. It started on October 24 ("Black Thursday") and continued until October 29, 1929 ("Black Tuesday"), when share prices on the New York Stock Exchange collapsed.
It was the most devastating stock market crash in the history of the United States, when taking into consideration the full extent and duration of its after effects.[1] The crash, which followed the London Stock Exchange's crash of September, signaled the beginning of the 12-year Great Depression that affected all Western industrialized countries.
The chart below doesn't look that bad
The Dow Jones Industrial Average, 1928–1930