The Passover story is interesting. God gives his people a celebration before he does the thing which they are to celebrate. He commands them to commemorate the Passover (Exodus 12) before the Exodus actually happens.

This shows us that God is concerned, not only about the event itself, but about how the event will shape the people. And he is very specific about how they are to observe Passover for the generations to come because he knows that how they celebrate will play a significant role in the kind of community they are.

How we celebrate matters. We celebrate communion week after week, not simply because we need to be reminded intellectually of Christ's sacrifice (though we need that too), but because that celebration forms us. We gather for worship week after week, not simply for obvious reasons (fellowship, inspiration, etc.), because if we are honest, there are a lot of places we could go for that stuff. We gather week after week because we acknowledge our need to be formed by a very particular story--the Story of God and His people!

Here's the thing: we don't always feel that formation happening. The Jewish people have observed Passover for generations, in times of great persecution (when God seemed absent), and in times of great joy. Celebration is as much about obedience as it is about anything else. So...let's obey God and celebrate!