It is Maundy Thursday. "Maundy" is a corruption of "mandatum,"
which means "command." That's where we get our word "mandate," and in
this case it refers to the commandment of Jesus to "love one another as I
have loved you," which is a pleasant thing to contemplate.
On
this day, your local churches might have foot-washing ceremonies, dramas
of the Last Supper, blessings of oils, or other rituals that call to
mind the Last Supper.
It's a good day to clean house if you have guests coming for Easter.