One of the first tasks I had to accomplish before receiving the contract to write It Happened in Chicago was to compile a list of events that I would include in the book, with a line or two about each explaining the importance or relevance.
My initial list had 100 events on it. The publisher wanted around 30 for the book. Among the many events I was not able to include was one that occurred on October 1, 1932. Here's a link to an excellent write-up on it from Chicagonow.com: Babe Ruth Calls His Shot.