My parish has Penitential Services, usually one in Advent and one in Lent, usually with one or at most two priests in attendance. There are usually several hundred people at each, from other parishes as well as my own. At the end of the service one of two things happen. Either:
a) We all go up to the priest, tell him “one sin” and then receive absolution, or
b) He gives us General Absolution, in which we all kneel in the pews, the priest extends his hands over us and says the Absolution for everybody at the same time. The prayer he says over us is: “God, the father of mercies, through the death and resurrection of his Son, has reconciled the world to Himself and sent the Holy Spirit among us for the forgiveness of sins. Through the ministry of the Church may God now give you pardon and peace, and I absolve you of your sine in the name of the Father and of the Son and of the Holy Spirit. Amen.”
Usually when he gives us Absolution as in (b), there is no individual confession, none of us tells our sins to the priest individually. when we have the other form that I desribe in (a), we all go up in line as though we’re going up to receive Holy Communion, and don’t tell all our sins, we just tell the priest one of them.