Black Friday (USA) 

Black Friday is the day following Thanksgiving Day in the United States (the fourth Thursday of November). Since 1952, it has been regarded as the beginning of the Christmas shopping season in the U.S., and most major retailers open very early (and more recently during overnight hours) and offer promotional sales. Black Friday is not an official holiday, but California and some other states observe "The Day After Thanksgiving" as a holiday for state government employees, sometimes in lieu of another federal holiday such as Columbus Day. Many non-retail employees and schools have both Thanksgiving and the following Friday off, which along with the following regular weekend, makes it a four-day weekend, thereby increasing the number of potential shoppers. It has routinely been the busiest shopping day of the year since 2005.