National Pineapple Upside-down Cake Day in USA
National Pineapple Upside-down Cake Day in USA is held on April 20. This event in the second decade of the month April is annual. 
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An upside-down cake is a cake usually made in a pan with a curved bottom. Once cooked, turned over and allowed to set, the cake is eaten upside-down. The term 'upside down cake' wasn't used very much before the middle of the 19th century, but the style of baking probably dates back much further, probably to the Middle Ages.
The classic American 'Pineapple Upside Down Cake' dates to sometime after 1903, when Jim Dole invented canned pineapple. The Hawaiin Pineapple Company ran an ad campaign in 1926 based on the fact that so many recipes for the cake had been submitted, naturally making the Pineapple Upside Down Cake even more popular.
An upside-down cake is a cake usually made in a pan with a curved bottom. Once cooked, turned over and allowed to set, the cake is eaten upside-down. The term 'upside down cake' wasn't used very much before the middle of the 19th century, but the style of baking probably dates back much further, probably to the Middle Ages.
The classic American 'Pineapple Upside Down Cake' dates to sometime after 1903, when Jim Dole invented canned pineapple. The Hawaiin Pineapple Company ran an ad campaign in 1926 based on the fact that so many recipes for the cake had been submitted, naturally making the Pineapple Upside Down Cake even more popular.
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