All of the activities of the sacristan are behind-the-scenes; setting up of the church, the altar and the offeratory gifts. Sacristans also prepare the different vessels used in Holy Mass including the Chalices and bowls as well as the linens used during Holy Communion. When the service is over, the sacristan cleans the vessels and prepares for the next service. Sacristans are needed for both weekday and weekend liturgies. Training sessions are given during the year.