St Agnes

On Monday we celebrate the Feast of St Agnes. Every year, lambs are taken from the Church of St Agnes Outside the Walls to the Vatican for a special Papal blessing. The wool from these lambs is used to make the pallia worn by Metropolitan Archbishops. Orbis Catholicus was there a couple of years ago to see the lambs in the Church of St Agnes. I'm hoping to do the same, but have been unable to track down what time the lambs are at the church. Any of my Roman or non-Roman readers know this?