It's
Shrove Tuesday! The day changes every year because it is determined by when Easter falls. It marks 47 days until Easter!
It is also celebrated as
Pancake Tuesday or
Pancake day in other countries and is the day in February or March immediately preceding Ash Wednesday (the first day of Lent), which is celebrated in some countries by consuming pancakes. In others, especially those where it is called
Mardi Gras or some translation thereof, this is a carnival day, and also the last day of "fat eating" or "gorging" before the fasting period of Lent.
This moveable feast is determined by Easter. The expression "Shrove Tuesday" comes from the word shrive, meaning "absolve". Shrove Tuesday is observed by many Christians, including Anglicans, Lutherans, Methodists and Roman Catholics, who "make a special point of self-examination, of considering what wrongs they need to repent, and what amendments of life or areas of spiritual growth they especially need to ask God's help in dealing with."