As Holy Week rolls on for Western Christians, today is Maundy Thursday. An assortment of food customs and revelry on Tuesday, Mardi Gras. Penitential ashes yesterday.
[Correction: I've compressed pieces of the liturgical calendar. As a commenter has explained, this is not Maundy Thursday. Yesterday was indeed Ash Wednesday, but now there's the period of Lent until everything else comes along: this year, Maundy Thursday on April 17th, and Easter on April 20th. I've been away from Christian churches for some time.]
Maundy Thursday (also known as Holy Thursday, Covenant Thursday, Great and Holy Thursday, Sheer Thursday and Thursday of Mysteries) is the Christian feast, or holy day, falling on the Thursday before Easter. It commemorates the Maundy and Last Supper of Jesus Christ with the Apostles as described in the Canonical gospels. It is the fifth day of Holy Week, and is preceded by Holy Wednesday and followed by Good Friday. (Wikipedia link)