The Eucharist makes the church.  How?

This is not the whole of the answer, but: Through anamnesis and anticipation.  Eucharist is a memorial of the death of Jesus; Eucharist is an anticipation of the marriage supper of the Lamb.

The church is a people of shared time, of shared past and future, the people distended in the “already,” the present, between shared memory and anticipation.

This is not a purely immanent account.  Since that time is God’s time - God’s past and God’s future, the church is a people who share in the history of God with humanity.