“The lay apostolate is in the world, performing works of mercy, working, raising families, and all that” - Romulus
“The laity carry out their manifold apostolate BOTH in the Church and in the world. In both areas there are various opportunities for apostolic activity.” - Chapter III, DECREE ON THE APOSTOLATE OF THE LAITY
Still waiting for something — anything — about the laity being called to do liturgical stuff.