The Feast of Our Lady, Mediatrix of All Graces
The Angelus Press missal says, “May 31 was the usual date for this Mass until the institution of the Feast of Our Lady Queen; since 1956 the day will probably vary with the Diocese.” Fr. Rock, FSSP notes the following due to the Feast of the Queenship of Mary added in 1956: "In the 1962 Roman Missal, the Mass of the Blessed Virgin Mary, Queen of All Saints and Mother of Fair Love and the Mass of the Blessed Virgin Mary, Mediatrix of All Graces are listed under May 8th along with the Mass of the Blessed Virgin Mary, Our Lady of the Sacred Heart of Jesus (Beatae Mariae Virginis D. N. a S. Corde lesu)."
While not yet a dogma of the Faith, Mary has "Mediatrix of All Graces" is widely held by the Church.
Concerning this feastday in the Dominican Rite:
For more information see Is There a Mediator with the "One Mediator Between God and Man"? based on the writings of St. Louis de Montfort
Litany to Our Lady Mediatrix of all Graces
Lord, have mercy on us. Christ, have mercy on us.
Lord, have mercy on us. Christ, hear us. Christ, graciously hear us.
God the Father of Heaven, Have mercy on us.
God the Son, Redeemer of the world, Have mercy on us.
God the Holy Ghost, Have mercy on us.
Holy Trinity, One God, Have mercy on us.
Holy Mary, pray for us!
Mother of God, and our Mother, pray for us!
True Mother of the living, pray for us!
Mother regenerating men in Christ unto God, pray for us!
Mother of piety and of grace, pray for us!
Mother of pardon and remission, pray for us!
Partner in human redemption, pray for us!
Recoverer of a lost world, pray for us!
Recoverer of the ages, pray for us!
Petitioner of all graces, pray for us!
Suppliant all-powerful, pray for us!
Advocate with thy Son for thy sons, pray for us!
Obtainer of the divine mercy, pray for us!
Dispenser of heavenly treasures, pray for us!
Handmaid of divine blessings, pray for us!
Fullness of grace to overflow upon all, pray for us!
Succor of the Church Militant, pray for us!
Ready helper of those in peril, pray for us!
Devoted consoler of the sorrowful, pray for us!
Conqueress of all error, pray for us!
Protectress of the world, pray for us!
Impregnable protection, pray for us!
Propitiation of the divine wrath, pray for us!
Refuge of all the unhappy, pray for us!
Shelter of orphans, pray for us!
Assured safety of the faithful, pray for us!
Hope of all who despair, pray for us!
Stay of the falling, pray for us!
Uplifter of the fallen, pray for us!
Cheer and comfort of the dying, pray for us!
Peace and joy of mankind, pray for us!
Our life, our sweetness and our hope, pray for us!
Gate of Paradise, pray for us!
Mystical stair of Jacob, pray for us!
Key of the heavenly kingdom, pray for us!
Channel of divine graces, pray for us!
Throne of divine clemency, pray for us!
Fountain of living waters, pray for us!
Fountain sealed by the Holy Spirit, pray for us!
Unfailing stream of mercy, pray for us!
Asylum of the erring, pray for us!
Haven of the shipwrecked, pray for us!
Shining star of the sea, pray for us!
Light of those who sit in darkness, pray for us!
Chamber of spiritual nuptials, pray for us!
Mediatrix of men with God, pray for us!
Mediatrix after the Mediator, pray for us!
Mediatrix reconciling us to the Son, pray for us!
Mediatrix of sinners, staunch and true, pray for us!
Mediatrix of all beneath the sky, pray for us!
Mediatrix ever pleading for us, pray for us!
Mediatrix set between Christ and His Church, pray for us!
Mediatrix who hast found favor with God, pray for us!
Mediatrix to win salvation for the world, pray for us!
Mediatrix of the mysteries of God, pray for us!
Mediatrix of all graces, pray for us!
Lamb of God, Who takest away the sins of the world, Spare us, O Lord.
Lamb of God, Who takest away the sins of the world, Graciously hear us, O Lord.
Lamb of God, Who takest away the sins of the world, Have mercy on us.
V. Pray for us, our powerful Mediatrix,
R. That we may be made worthy of the promises of Christ!
Let us Pray.
O Lord Jesus Christ, our Mediator with the Father, Who hast deigned to appoint the Blessed Virgin, Thy Mother, to be our Mother also and our Mediatrix with Thee, graciously grant that whosoever goes to Thee in quest of blessings may be gladdened by obtaining them all through her, Thou Who livest and reignest with the Father and the Holy Ghost, ever one God, world without end. R. Amen.
Prayer of Petition
O Ever-Virgin Mother of God and Mediatrix of Grace who art the House of Gold within which dwells thy Son, our Mediator, Jesus Christ, we humbly beseech thee to grant our requests for our salvation and the salvation of the entire world. (Here pause and make your requests) Keep us close to the Vicar of thy Son in the unity of the One, Holy, Catholic, Apostolic and Roman Church. Hear our prayer and grant the requests we make to thee.
St. Joseph, Intercede for us.
St. Jude Thaddeus, Pray for us.
St. Mary of Cleophas, Pray for us.
St. Philip Neri, Pray for us.
St. Louis Grignion de Montfort, Pray for us.
St. Maximillian Kolbe, Pray for us.
While not yet a dogma of the Faith, Mary has "Mediatrix of All Graces" is widely held by the Church.
Concerning this feastday in the Dominican Rite:
Interestingly, this feast never made its way into the liturgical calendar of the Roman Rite. It is included in the 1962 Roman Missal as an optional feast, for use in certain places and diocese. As best as I can tell, it first appeared on the Dominican liturgical calendar in the 1940's, and it moved around a bit until it finally landed on May 8 in the 1961 calendar. The 1949 Completotori Libellus has the feast on May 31. The 1955 English translation of the Dominican Martyrology has the feast on May 31. The 1959 St. Dominic Missal has it on June 7. [In the Post Vatican II Dominican Calendar], it has been removed from the calendar of the Order, which now celebrates the Patronage of the Blessed Virgin Mary on May 8. Source: Brevarium SOP
Christ as the One Meditator
Concerning the title of Mediatrix, Fr. Reginald Garrigou‑Lagrange, O.P. discusses the office of mediator:
"The office of mediator belongs fully only to Jesus, the Man‑God, Who alone could reconcile us with God by offering Him, on behalf of men, the infinite sacrifice of the Cross, which is perpetuated in Holy Mass. He alone, as Head of mankind, could merit for us in justice the grace of salvation and apply it to those who do not reject His saving action. It is as man that He is mediator, but as a Man in Whom humanity is united hypostatically to the Word and endowed with the fullness of grace, the grace of Headship, which overflows on men. As St. Paul puts it: 'For there is one God, and one mediator of God and men, the man Christ Jesus: Who gave Himself for a redemption for all, a testimony in due times' (I Tim. ii, 56). \
"But, St. Thomas adds: 'there is no reason why there should not be, after Christ, other secondary mediators between God and men, who co‑operate in uniting them in a ministerial and dispositive manner.’ Such mediators dispose men for the action of the principal Mediator, or transmit it, but always in dependence on His merits.”
Our Lady as the Mediator with the Mediator
Why, though, is our Lady the Mediatrix of All Graces? Why her specifically? St. Pius X stated why: "By the communion of sorrows and of will between Christ and Mary she merited to become the dispenser of all the benefits which Jesus acquired for us by shedding His Blood" (Ad Diem Illium). This resonates with what Pope Leo XIII had previously affirmed: "It may be affirmed that, according to God's will, nothing comes to us without going through Mary's hands. Just as no one can approach the Almighty Father except through the Son, so no one can approach the Almighty Father except through the Son, so no one can approach Christ except through His Mother" (Octobri Mense)
St. John Vianney's words from a few centuries before these holy pontiffs bear similar testimony: "All the saints have a great devotion to Our Lady: no grace comes from Heaven without passing through her hands. We cannot go into a house without speaking to the doorkeeper. Well, the Holy Virgin is the doorkeeper of Heaven.”
For more information see Is There a Mediator with the "One Mediator Between God and Man"? based on the writings of St. Louis de Montfort
Litany to Our Lady Mediatrix of all Graces
Lord, have mercy on us. Christ, have mercy on us.
Lord, have mercy on us. Christ, hear us. Christ, graciously hear us.
God the Father of Heaven, Have mercy on us.
God the Son, Redeemer of the world, Have mercy on us.
God the Holy Ghost, Have mercy on us.
Holy Trinity, One God, Have mercy on us.
Holy Mary, pray for us!
Mother of God, and our Mother, pray for us!
True Mother of the living, pray for us!
Mother regenerating men in Christ unto God, pray for us!
Mother of piety and of grace, pray for us!
Mother of pardon and remission, pray for us!
Partner in human redemption, pray for us!
Recoverer of a lost world, pray for us!
Recoverer of the ages, pray for us!
Petitioner of all graces, pray for us!
Suppliant all-powerful, pray for us!
Advocate with thy Son for thy sons, pray for us!
Obtainer of the divine mercy, pray for us!
Dispenser of heavenly treasures, pray for us!
Handmaid of divine blessings, pray for us!
Fullness of grace to overflow upon all, pray for us!
Succor of the Church Militant, pray for us!
Ready helper of those in peril, pray for us!
Devoted consoler of the sorrowful, pray for us!
Conqueress of all error, pray for us!
Protectress of the world, pray for us!
Impregnable protection, pray for us!
Propitiation of the divine wrath, pray for us!
Refuge of all the unhappy, pray for us!
Shelter of orphans, pray for us!
Assured safety of the faithful, pray for us!
Hope of all who despair, pray for us!
Stay of the falling, pray for us!
Uplifter of the fallen, pray for us!
Cheer and comfort of the dying, pray for us!
Peace and joy of mankind, pray for us!
Our life, our sweetness and our hope, pray for us!
Gate of Paradise, pray for us!
Mystical stair of Jacob, pray for us!
Key of the heavenly kingdom, pray for us!
Channel of divine graces, pray for us!
Throne of divine clemency, pray for us!
Fountain of living waters, pray for us!
Fountain sealed by the Holy Spirit, pray for us!
Unfailing stream of mercy, pray for us!
Asylum of the erring, pray for us!
Haven of the shipwrecked, pray for us!
Shining star of the sea, pray for us!
Light of those who sit in darkness, pray for us!
Chamber of spiritual nuptials, pray for us!
Mediatrix of men with God, pray for us!
Mediatrix after the Mediator, pray for us!
Mediatrix reconciling us to the Son, pray for us!
Mediatrix of sinners, staunch and true, pray for us!
Mediatrix of all beneath the sky, pray for us!
Mediatrix ever pleading for us, pray for us!
Mediatrix set between Christ and His Church, pray for us!
Mediatrix who hast found favor with God, pray for us!
Mediatrix to win salvation for the world, pray for us!
Mediatrix of the mysteries of God, pray for us!
Mediatrix of all graces, pray for us!
Lamb of God, Who takest away the sins of the world, Spare us, O Lord.
Lamb of God, Who takest away the sins of the world, Graciously hear us, O Lord.
Lamb of God, Who takest away the sins of the world, Have mercy on us.
V. Pray for us, our powerful Mediatrix,
R. That we may be made worthy of the promises of Christ!
Let us Pray.
O Lord Jesus Christ, our Mediator with the Father, Who hast deigned to appoint the Blessed Virgin, Thy Mother, to be our Mother also and our Mediatrix with Thee, graciously grant that whosoever goes to Thee in quest of blessings may be gladdened by obtaining them all through her, Thou Who livest and reignest with the Father and the Holy Ghost, ever one God, world without end. R. Amen.
Prayer of Petition
O Ever-Virgin Mother of God and Mediatrix of Grace who art the House of Gold within which dwells thy Son, our Mediator, Jesus Christ, we humbly beseech thee to grant our requests for our salvation and the salvation of the entire world. (Here pause and make your requests) Keep us close to the Vicar of thy Son in the unity of the One, Holy, Catholic, Apostolic and Roman Church. Hear our prayer and grant the requests we make to thee.
St. Joseph, Intercede for us.
St. Jude Thaddeus, Pray for us.
St. Mary of Cleophas, Pray for us.
St. Philip Neri, Pray for us.
St. Louis Grignion de Montfort, Pray for us.
St. Maximillian Kolbe, Pray for us.