National Chocolate Milkshake Day
National Chocolate Milkshake Day is held on September 12. United States. This event in the second decade of the month September is annual. 
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The word “milkshake” was first printed in 1885, but it wasn't for the kid-friendly treat we think of today. Instead, the first milkshakes were a combination of cream, eggs, and whiskey! By the early 1900s, whiskey milkshakes were replaced for ones made with flavored syrups and malted milk.
The modern milkshake was born in 1922, when an employee at a Chicago Walgreens, Ivar “Pop” Coulson, was inspired to add two scoops of ice cream to malted milk. In 1922, the blender was created specifically for creating milkshakes. The world's largest milkshake was 6,000 gallons, according to the Guinness Book of World Records.
Similar holidays and events, festivals and interesting facts
National Milkshake Day in USA on August 1
National Vanilla Milkshake Day and Ice Cream Soda Day in USA on June 20
National Bagelfest Day and National Coffee Milkshake Day in USA on July 26
National Hot Cross Bun in USA on September 11
National Coffee Day in Costa Rica on September 12
National or International Chocolate Day on September 13 (United States, the U.S. National Confectioners Association);
National Cachaça Day in Brazil on September 13
National Peanut Day in USA on September 13
Borscht Day in Ukraine on September 13 (Celebrated on the second Saturday of September)