Dr. Bret Welstead, Pastor of Worship and Creative Arts, looks at Mark 12:12-26 and the Passover / The Last Supper. When we worship, we rehearse or enact God's story. Not so that we can perform but can be formed. The purposes of the Lord's Supper are:

Memorial - looking  into the past to remember how God has saved us.
Communion - looking at the present to see how we are one in Jesus.
Eucharist - looking into the future with thanksgiving to the return of Jesus.