May a person who has not been baptized participate in Holy Communion?

Yes, our church does not seek to close God's Table, although the historic and normal Christian order of the sacraments is baptism first — as birth into the family — and Communion following, as continuing nurture at the family table. Pastors and congregations reach out and encourage those who partake at the Table to share fully in the life of God's people, including coming to the font after appropriate preparation.

From FAQs About Baptism, Membership, and Salvation

Learn more about baptism -
By Water and The Spirit
This is Your Baptismal Liturgy

Learn more about Communion