I. MASS WITH A CONGREGATION
115. By "Mass with a congregation" is meant a Mass celebrated with the participation of the faithful. It is moreover appropriate, whenever possible, and especially on Sundays and holy days of obligation, that the celebration of this Mass take place with singing and with a suitable number of ministers.[95] It may, however, also be celebrated without singing and with only one minister.
116. If a deacon is present at any celebration of Mass, he should exercise his office. Furthermore, it is desirable that, as a rule, an acolyte, a lector, and a cantor should be there to assist the priest celebrant. In fact, the rite to be described below foresees a greater number of ministers.
The Articles to Be Prepared
117. The altar is to be covered with at least one white cloth. In addition, on or next to the altar are to be placed candlesticks with lighted candles: at least two in any celebration, or even four or six, especially for a Sunday Mass or a holy day of obligation. If the diocesan Bishop celebrates, then seven candles should be used. Also on or close to the altar, there is to be a cross with a figure of Christ crucified. The candles and the cross adorned with a figure of Christ crucified may also be carried in the Entrance Procession. On the altar itself may be placed the Book of the Gospels, distinct from the book of other readings, unless it is carried in the Entrance Procession.
118. The following are also to be prepared:
a. Next to the priest's chair: the Missal and, as needed, a hymnal;
b. At the ambo: the Lectionary;
c. On the credence table: the chalice, a corporal, a purificator, and, if appropriate, the pall; the paten and, if needed, ciboria; bread for the Communion of the priest who presides, the deacon, the ministers, and the people; cruets containing the wine and the water, unless all of these are presented by the faithful in procession at the Offertory; the vessel of water to be blessed, if the asperges occurs; the Communion- plate for the Communion of the faithful; and whatever is needed for the washing of hands.
It is a praiseworthy practice to cover the chalice with a veil, which may be either the color of the day or white.
119. In the sacristy, the sacred vestments (cf. nos. 337-341) for the priest, the deacon, and other ministers are to be prepared according to the various forms of celebration:
a. For the priest: the alb, the stole, and the chasuble;
b. For the deacon: the alb, the stole, and the dalmatic; the dalmatic may be omitted, however, either out of necessity or on account of a lesser degree of solemnity;
c. For the other ministers: albs or other lawfully approved attire.[96]
All who wear an alb should use a cincture and an amice unless, due to the form of the alb, they are not needed. When there is an Entrance Procession, the following are also to be prepared: the Book of the Gospels; on Sundays and festive days, the thurible and the boat with incense, if incense is used; the cross to be carried in procession; and candlesticks with lighted candles.
From: GENERAL INSTRUCTION OF THE ROMAN MISSAL