The Feast of Mercy is to be celebrated on the Sunday after Easter. (Divine Mercy Sunday)
The Feast should be preceded by a Novena of Chaplets starting on Good Friday.
The Sermon by the priest on that day should be on the Mercy of God.
That we contemplate on the day the Mystery of Redemption as the greatest Revelation of Divine Mercy.
The Image of Divine Mercy is to be ceremoniously blessed by the priest on the day.
The Image should be exposed and publicly venerated.
Confession and communion on the day (or as close as possible to the Feast). The Communion should be a worthy one, accompanied by complete Trust in Divine Mercy.
An Act of Mercy should take place in our lives (Mercy in Deed, Word, and Prayer -- forgiving and comforting, corporal works of mercy, prayers for mercy for the world).