Sacristans.

In nearly every parish, there are men and women who do the quiet work of preparing for and assisting at Mass. Sacristans may care for altar linens, order wine and hosts, arrange liturgical books for the altar, lay out vestments for the clergy, light candles and even help with cleaning up after the Mass has ended.

Altar Server.
An altar server is a lay assistant to a member of the clergy during a Christian liturgy. An altar server attends to supporting tasks at the altar such as fetching and carrying, ringing the altar bell, helps bring up the gifts, brings up the book, among other things.