The role of the sacristan is an important ministry.
The most typical responsibility of sacristans is to prepare what is required for the celebration of Mass.
So that everything is in place to celebrate the Liturgy of the Word, sacristans will check to see that the Lectionary for Mass (contains the Scripture readings used at Mass) is open to the correct readings for the day and is left where the Minister of the Word can look over the texts before Mass.
Candles, incense and other requirements may also need to be prepared by the sacristan (servers may also assist).
As you can see, there is a lot of crucial “behind the scenes” work that sacristans do!