Sacristans are adults and high school teens who are trained to prepare the Sanctuary and Altar for the Celebration of the Eucharist. Sacristans are knowledgeable about the contents of the Sacristy (sacred vessels, vestments, incense, Eucharistic elements, liturgical books, candles). Sacristans are also instrumental in preparing the Church for the various liturgical seasons and opening and closing the doors of the church.