Ash Wednesday in the Christian diary is traditionally known as the first day of Lent as described below.

https://www.britannica.com/topic/Ash-Wednesday-Christian-holy-day
Daily Christian thoughts music, poems based around God
Category: Lent

https://www.britannica.com/topic/Ash-Wednesday-Christian-holy-day

Shrove Tuesday, also known as Pancake Day, is a special day celebrated in many Christian countries. It is observed the day before Ash Wednesday, which marks the beginning of Lent. Shrove Tuesday is traditionally a day of indulgence, where people enjoy rich foods like pancakes before the fasting period of Lent begins. The name “Shrove” comes from the word “shrive,” which means to confess sins and seek absolution.
In Scotland, as well as in other countries, people often celebrate by making and eating pancakes. It’s a day filled with fun, food, and sometimes even pancake races! Have you got any special plans for Shrove Tuesday?