Feast of Divine Mercy
In February 1931 Jesus appeared to a Polish nun, Sr. Faustina Kawalska, and asked that the Sunday after Easter be celebrated as a Feast of Mercy and be preceded by a novena beginning on Good Friday. Jesus promised that those who go to confession and communion on that day will obtain a complete remission of all sin and all punishment due to sin. The novena begins on Good Friday and ends on the Sunday after Easter. In 2000 Pope John Paul added Divine Mercy Sunday to the calendar as a feast. He canonized Sr. Faustina on April 30, 2000, the Feast of Divine Mercy.
                                                                                                                  from Catholic Culture.org