Uncle Sam Day
Uncle Sam Day is held on September 13. This event in the second decade of the month September is annual. 
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The tall, white-haired, white-bearded figure is the national personification of government. In 1961, Congress recognized Samuel Wilson of Troy, New York, as the progenitor of this celebrated American symbol.
The official version states that his link to the government dates back to the War of 1812, when butcher Samuel Wilson of Troy supplied food to the U.S. Army. Samuel packaged the meat with the initials "US".
Many soldiers began calling him "Uncle Sam" and eventually the initials of his nickname (US) became associated with the U.S. government itself.
Similar holidays and events, festivals and interesting facts
Video Games Day on September 12 (The Nimrod was a computer built and displayed at the Festival of Britain in 1951 and designed to play a game called Nim);
Defy Superstition Day on September 13
Blame Somebody Else Day on September 13
Positive Thinking Day on September 13
Roald Dahl Day on September 13
Super Mario Bros Day on September 13
Fist of the North Star Day on September 13
International Dot Day on September 15
Confucius Day on September 15 (Confucius' birthday falls on the 27th day of the eighth lunar month according to the Chinese calendar);
Felt Hat Day on September 15