"Let no soul fear to approach Me, though its sins be as scarlet," said Jesus.
Jesus promised an incredible treasure -- total remission of sin and of punishment! -- to those who would go to Confession and receive Holy Communon on that day. (The Church allows the Confession to be a little before or after the Feast.)
Time for us all to seek Divine Mercy and to become more merciful ourselves -- doing, as Jesus commanded, deeds of mercy that arise from love of Him.
And we should spread this devotion so everyone can learn of it.
Click on this post's title for a good, thorough resource on Divine Mercy, the Chaplet, the Feast, etc.