Happy Easter! This Sunday is the eighth day of the Octave of Easter, so it is still considered Easter Day itself. So keep celebrating. This Sunday is also known as Divine Mercy Sunday.
This Sunday, April 11th is Divine Mercy Sunday. In a series of revelations to St. Maria Faustina Kowalska in the 1930s, our Lord called for a special feast day to be celebrated on the Sunday after Easter. Today, we know that feast as Divine Mercy Sunday, named by Saint Pope John Paul II at the canonization of St. Faustina on April 30, 2000.