The Communal Character of the Liturgy
Liturgical services are not private functions, but are celebrations of the Church, which is the "sacrament of unity," namely, the holy people united and ordered under their bishops (St. Cyprian, On the Unity of the Catholic Church, 7; cf. Letter 66, n. 8, 3).
Therefore, liturgical services pertain to the whole body of the Church; they manifest it and have effects upon it; but they concern the individual members of the Church in djfferent ways, according to their differing rank, office, and actual participation.
It is to be stressed that whenever rites, according to their specific nature, make provision for communal celebration involving the presence and active participation of the faithful, this way of celebrating them is to be preferred, so far as possible, to a celebration that is individual and quasi-private.
This applies with especial force to the celebration of Mass and the administration of the sacraments, even though every Mass has of itself a public and social nature.
-Constitution on the Sacred Liturgy, Sacrosanctum Concilium # 26-27