same as mardi gras "Shrove Tuesday"

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Note added at 17 mins (2008-11-07 10:02:02 GMT)
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... we are told, on Shrove Saturday, i.e., the Saturday before Ash Wednesday, and remained there until Holy Saturday, the eve of Easter Sunday. ...
www.libraryireland.com/HealyEssays/Patrick2.php

Shrove Saturday Planning. 12:30 p.m. 150th Banquet Committee. Library ... Saturday, February 2, 5:00 p.m. Shrove Saturday Evening-Pancake Supper and Youth ...
www.central-presbyterian.org/worship/pdf_bulletin/080113_bu...

Disheartened, Patrick remains on Croaghpatrick from Shrove Saturday to Easter Saturday, abstaining from both food and drink. As to Moses, God ...
[email protected]/msg00115.html" rel="nofollow noopener" target="_blank">www.mail-archive.com/[email protected]/ms...

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Note added at 1 day2 mins (2008-11-08 09:47:11 GMT)
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Dictionnaire Le Robert & Collins:
Shrovetide : les jours gras (les les trois jours précédant précédant le Carême) - ex. Shrove Tuesday (le) Mardi gras

Shrove Tuesday is the term used in Ireland, the United Kingdom,[1] Australia,[2] and Canada to refer to the day after Shrove Monday (or the more old fashioned Collop Monday) and before Ash Wednesday (the liturgical season of Lent begins on Ash Wednesday). In Ireland, the UK, and amongst Anglicans, Lutherans and possibly other Protestant denominations in Canada including Newfoundland, Nova Scotia, Prince Edward Island and New Brunswick, this day is also known as Pancake Day, because it is customary to eat pancakes on this day.[3][4][5] In other parts of the world—for example, in historically CATHOLIC AND FRENCH-SPEAKING PARTS OF THE UNITED STATES and elsewhere—this day is called Mardi Gras. In areas with large Polish-immigrant populations (for example, Chicago) it is known as Tłusty Czwartek (literally: Fat Thursday) and celebrated on the Thursday before Lent. And in areas with large German-immigrant populations (for example, Pennsylvania Dutch Country) it is known as Fasnacht Day (also spelled Fausnacht Day and Fauschnaut Day.
The word shrove is a past tense of the English verb "shrive," which means to obtain absolution for one's sins by confessing and doing penance.[6] Shrove Tuesday gets its name from the shriving (confessing) that Anglo-Saxon Christians were expected to do prior to receiving absolution immediately before Lent.

The term "Shrove Tuesday" is not widely known in the United States, especially in those regions that celebrate Mardi Gras on the day before Ash Wednesday (AND THAT IS PROBABLY BECAUSE THE MOST FAMOUS ONE IN USA IS CELEBRATED IN NEW ORLEANS)