Catechism of the Catholic Church, 903
“Lay people who possess the required qualities can be admitted permanently to the ministries of lector and acolyte. ‘When the necessity of the Church warrants it and when ministers are lacking, lay persons, even if they are not lectors or acolytes, can also supply for certain of their offices, namely, to exercise the ministry of the word, to preside over liturgical prayers, to confer Baptism, and to distribute Holy Communion in accord with the prescriptions of law.'”
Acolytes are commissioned by the Archdiocese to serve the faithful in the celebration of the liturgy and in particular assist the priest and deacon especially in the celebration of the Mass. Acolyte responsibilities include those of a Sacristans.