Dear Ambrose: My parish is renewing their baptismal covenant on the Baptism of our Lord. At the Eucharist, do we use the proper preface for Baptism or Epiphany?
Thanks for your question! If you have a baptism you use the preface for baptism, found on p. 381 in the Book of Common Prayer. If there is no baptism and your parish is (rightly) renewing their Baptismal Covenant, you use the preface for Epiphany, found on p. 378.