National Microfilm Week in USA
National Microfilm Week in USA is held on September 24. Acknowledging the important contributions made by microfilm in the day-to-day life of America and the accomplishments of the microfilm, President to designate the week which begins on September 24, 1972, as National Microfilm Week. PROCLAMATION 4158. This event in the third decade of the month September is annual. 
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The first practical use of commercial microfilm was developed by a New York City banker, George McCarthy, in the 1920's. He was issued a patent in 1925 for his Checkograph machine, designed to make permanent film copies of all bank records.
When compared to paper documents, microfilm can reduce space storage requirements by up to 95 percent. Microfilm is also virtually cost free once filmed while a digital archive does have maintenance costs associated with servers and upkeep.
Microfilm is comprised of a plastic support (nitrate, acetate, or polyester) with a silver-gelatin emulsion. It is typically unperforated 16mm or 35mm roll film. A larger 105mm was used for the transfer to preservation microfiche, but it is only occasionally found in collections.
Similar holidays and events, festivals and interesting facts
Checkers Day on September 23
World Day Against Software Patents on September 24 (Brussels, 2nd September 2008 — A global coalition of more than 80 software companies, associations and developers has declared the 24th of September to be the “World Day Against Software Patents”);
US Comic Book Day on September 25
World Dream Day on September 25
One-Hit Wonder Day on September 25
Johnny Appleseed Day on September 26 (What many people don’t know is that Johnny Appleseed was no mere legend, but was, in fact, a missionary known by the name of John Chapman. Born in Leominster, Massachusetts in 1774);
Hug a Vegetarian Day on September 27
Crush a Can Day on September 27