What are movable holidays?
Movable Holidays are ones that do not always occur on the same day or date each year. Movable Holidays are also the hardest holidays to keep up because individuals will unknowingly list them as occurring on the same day each year when they are indeed a movable holiday. (for example: bloggers & personal websites) Therefore it creates a snowball effect where incorrect dates are listed all over the Internet.
The Fact Is:
Finding factual information, the creator, or the origin of all holidays is very hard to do. Even though a holiday is referred to as a "National" day, a/any congressional records or presidential proclamations for this day may not be found. Even if it's not, it may still be a holiday that is publicized to celebrate. So have fun with it and celebrate it!
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Further, by metaphoric extension to mean a party on the move — or simply as a misnomer — Ernest Hemingway used the term A Moveable Feast for the title of his memoirs of life in Paris in the 1920s. This usage has become a popular phrase in food contexts, with several catering companies adopting it as their name.
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Moveable Feasts!
"In Christianity, a moveable feast or movable feast is a holy day — a feast day or a fast day — whose date is not fixed to a particular day of the calendar year but moves in response to the date of Easter, the date of which varies according to a complex formula. Easter is considered by some to itself be a "moveable feast"."
"By extension, other religions' feasts are occasionally described by the same term. In addition many countries have secular holidays that are moveable, for instance to make holidays more consecutive; the term "moveable feast" is not used in this case however."