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.
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References in periodicals archive ?
May 9 is an immovable feast, Bautista told reporters in a press briefing.
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.
Lunch and tea are immovable feasts, but that still doesn't excuse the acceptance of offers of bad light by an England side which were all too eager to head for the dressing room at the first opportunity.