The Anniversary of the New York Stock Market Crash (October 24, 1929) is observed on October 24 and marks the beginning of the most significant economic crisis of the twentieth century. On this day, the New York Stock Exchange experienced a dramatic collapse in share values, an event later known as "Black Thursday." Millions of shares were rapidly sold, causing a sudden and severe drop in market value; it is estimated that about 13 million shares changed hands on this day, setting an unprecedented record at the time. The stock market crash on October 24, 1929, triggered the Great Depression, which affected the United States and many other countries for years. The crisis led to the bankruptcy of thousands of banks and companies, and millions of people lost their jobs. The aftermath of this event changed economic and social policies in many nations and resulted in widespread reforms in the financial system. In the Gregorian calendar, this day is recognized as a reminder of one of the most important economic events of the twentieth century. The anniversary of the New York Stock Market Crash is often marked by economic analyses and reflections on its historical consequences, providing an opportunity to reconsider financial and economic policies. The event remains a cautionary example of the importance of risk management and oversight in financial markets. This day was officially designated and included in the Gregorian calendar as the anniversary of the New York Stock Market Crash of October 24, 1929, due to its historical and economic significance.