Feast Day of the Blessed Virgin Mary, Mother of the Church
MemorialFrom the USCCB website for the feast of Mary, Mother of the Church:
"The title of Mother of the Church has been bestowed on the Blessed Virgin Mary because she gave birth to Christ, the Head of the Church, and became Mother of the redeemed before her Son gave up his spirit on the Cross. Pope Saint Paul VI solemnly confirmed the same title in an address given to the Fathers of the Second Vatican Council on November 21, 1964 and established that 'by this sweetest of names the whole Christian people should henceforth give still greater honor to the Mother of God.'"
USCCB.org/motherofthechurch