The Aparecida bishops suggest the primary mission of a parish pastoral council. And it’s not how often the grass gets cut:
203. A parish, community of missionary disciples, needs committees that move beyond any sort of bureaucracy. Parish Pastoral Councils will have to be formed by missionary disciples continually concerned to reach out to all. The Economic Concerns Committee, together with the entire parish community, will work to obtain necessary funding, so that the mission may advance and become a reality in all environments.
Spiritual formation is essential:
These and all such committees must be inspired by a spirituality of missionary communion: Unless we follow this spiritual path, external structures of communion will serve very little purpose. They would become mechanisms without a soul, “masks” of communion rather than its means of expression and growth. (Cf. Novo Millennio Ineunte 43)
This is rather different from gatherings of accountants and businessfolk and hyper-active parishioners who will say yes to another involvement or who want a say in how a parish spends its budget.
For deeper examination, an English translation of the 2007 document from the Aparecida Conference.