July 9th is the Patronal Solemnity of Our Lady of the Atonement, with the celebration being transferred this year to Sunday, July 7th.
Fr. Paul of Graymoor wrote these words about the title in 1919:
I am writing this letter on the day which we are accustomed to observe at Graymoor in special honor of Our Lady of the Atonement. This particular name of Our Blessed Mother is very dear to us and we believe it is dear to Our Lady herself. We hold it as among the most treasured and sacred traditions of our Institute that it was the Blessed Virgin who first taught us to call her by that name and there are cogent reasons why she should give this title a favorite place among the many by which she is invoked.
First among these reasons must be her own devotion to the mystery of the Atonement, for it was by the death of her son on the Cross, which cost him the last drop of his blood and made her preeminently the mother of sorrows, that the wall of division between God and man was broken down and both were made one (Ephesians 2:14), through Christ's atoning sacrifice.
As the Blessed Virgin is inseparably associated with our divine redeemer in the mystery of his incarnation, so is she closely associated with him in the great act of the atonement. Thus, is she always represented in the Gospel and in the liturgy and thought of the Catholic Church as standing by the cross, when Christ was crucified there.
There is a second reason, hardly less weighty than the first, why the title, Our Lady of the Atonement, should powerfully appeal to the mother of God. It was through the Incarnation she become the mother of Christ, but through the atonement she became the new Eve and the mother of all the regenerate, who being redeemed by the precious blood are predestined to eternal life as the adopted sons of God and heirs of the Kingdom of Heaven. The third time Our Lord spoke upon the cross it was to emphasize this phase of the Atonement, when he said to his mother: "Woman, behold your son," and to St. John, "Son, behold your mother." [John 19:26-27] Thus by virtue of the atonement Mary is the mother of all who live through Christ. Can anyone therefore possibly conceive the depth of significance this title "Our Lady of the Atonement" must possess for Our Blessed Mother herself?
But someone will ask, if so highly esteemed, why should it be kept hidden for nineteen hundred years, to be made known to the faithful in the twentieth century? Is it not the custom even of earthly mothers to preserve the choicest fruits in the summer time and hide them away under lock and key, to bring them forth to their children's delight in the depth of winter and did not the master of the wedding feast say to the bridegroom at Cana, "Every man at first brings forth good wine and when men have well drunk, then that which is worse. But you have kept the good wine until now." [John 2:10] "My ways are not your ways," [Isaiah 55:8] says the Lord of Hosts.
Stabant juxta crucem Jesu mater ejus, et soror matris ejus Maria Cléophæ, et Salóme, et María Magdaléne. Múlier, ecce filius tuus: dixit Jesus; ad discípulum autem: Ecce mater tua.
Deus, qui dispersa congregas, et congregáta consérvas: quæsumus, per intercessiónem beatíssimæ Vírginis Maríæ, Dóminæ nóstræ Adunatiónis, super ecclésiam tuam uniónis grátiam clementer infunde; et Spíritum Sánctum in totam múndi latitúdinem defunde ut omnes unum sint; per Dóminum nostrum Jésum Christum Filium tuum, qui tecum vivit et regnat in unitáte Spíritus Sáncti, Deus, per ómnia sæcula sæculorum. Amen.
O God, who dost gather together those who have been scattered, and who dost preserve those who have been gathered together: We beseech thee through the intercession of the most Blessed Virgin Mary, Our Lady of the Atonement, that thou wilt pour out upon thy Church the grace of unity and send thy Holy Ghost upon all mankind, that they may be one; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee in the unity of the same Holy Ghost ever, one God, world without end. Amen.