From A Reluctant Sinner:
. . . Pope Pius XII decreed in 1958 that the Feast of the Holy Face of Jesus was to be kept on the day before Ash Wednesday, commonly known as Shrove Tuesday. Of course, the devotion to the Holy Face is an ancient one, which has been observed by many saints since the earliest centuries, St Thérèse of Lisieux (also known as St Thérèse of the Child Jesus and the Holy Face) being the most well-known. It is also a feast that, despite the efforts of some liturgical ‘reformers’, is still kept in many dioceses throughout the world, including Rome.
The most recent Mass of the Holy Face of Jesus for Shrove Tuesday was approved by Pope John Paul II in 1986 . . .
But throughout England, North America and in particular among Catholic, Anglican and Lutheran traditions, Shrove Tuesday is Pancake Day. If I don’t make the connection, someone else will.