Before the final plague strikes the land of Egypt, God tells the Israelites that they will celebrate this day forever. It will re-order their calendar and become a festival to be commemorated throughout their lives and for all generations of their people.
Do you realize God make that same kind of promise for you? When you are enslaved, down trodden, up against it, God tells us all to start planning a party. Plan it NOW, while things are still a mess. Plan it so you may be sure of God's gracious deliverance from whatever troubles you.