The feast of the Queen of Apostles was established on the first Saturday after the Ascension by the Sacred Congregation of Rites at the request of the Pallottine Fathers. Mary initiated her mission as Queen of Apostles in the Cenacle. She gathered the apostles together, comforted them, and assisted them in prayer. Together with them she hoped, desired and prayed; with them her petitions were heeded and she received the Holy Spirit on the day of Pentecost.
Mary is Queen of Apostles because she was chosen to be the Mother of Jesus Christ and to give him to the world; she was made the apostles' Mother and our own by our Savior on the cross. She was with the apostles while awaiting the descent of the Holy Spirit, obtaining for them the abundance of supernatural graces they received on Pentecost. The most holy Virgin was and always will be the wellspring for every apostolate.