immovable feast

Related to immovable feast: immovable joint

immovable feast

n.
A religious holiday, such as Christmas, that does not change in date from year to year.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
May 9 is an immovable feast, Bautista told reporters in a press briefing.
Some of these are pretty well immovable feasts: the Budget, for instance, is almost always in March, the local elections in May, the party conferences in the autumn and the Queen's Speech in November.
BRITE, TED, Davos, sxsw, Ignite: the immovable feasts of the great religio-business calendar, where dapper gents with bubbles and sparkles on their business cards exchange triumphalist ideas by day and then charge $14,000 in drinks by night.