This is the Feastday of Our Lady, Queen of Apostles, is one of the Masses in Some Places that were a part of the Traditional Catholic Missal.
The Divine Life of the Most Holy Virgin”, by Ven. Mary of Agreda, pgs. 220-221:
Holy Exercises in the Supper-Room Before Pentecost:
She [Mary] assembled them together twice a day in the Supper-room, and being commanded by St. John or St. Peter to speak, explained to them for one hour the mysteries of faith, as if she were conversing with them, rather than teaching them as their Mistress and Queen. She explained the mysteries of the Hypostatic Union and all those contained in the ineffable and divine Incarnation. After this she bade them entertain themselves for one hour longer on the counsels, promises and doctrines they had learned from their Divine Master; to consecrate another part of the day to the recital of the Pater Noster, with some psalms; and to employ the rest of the time in mental prayer. In the evening they took some slight nourishment of bread, fruits and fish; thus by prayer and fasting they prepared for the coming of the Holy Spirit. She incited them to mental prayer, teaching them its excellence and necessity, because the noblest occupation of the reasonable creature is to raise his mind above created things to meditate on the divine, and that nothing should be preferred to this holy exercise.
By these holy lessons, the Mother of Wisdom and the Mistress of Charity enlightened the minds and inflamed the hearts of the Apostles and disciples, filling them with fervor and disposing them to receive the precious gifts of the Paraclete…The following reflection for today is from OUR LADY'S FEASTDAYS by Rev. Lawrence G. Lovasik, S.V.D.
1. Mary, Mother of God, at Pentecost you were with the Apostles, preparing for the Holy Spirit the promised Gift of your Son. Prayer was the soul of your preparation, and the Apostles were inspired by your example. When the Holy Spirit descended, you received the richest outpouring of His graces. Your holiness was due to this Spirit of Love, to Whose guidance you abandoned yourself. All that He could give, He bestowed upon you, His Immaculate Bride. On the day of Pentecost the Apostles' worldly views about the Kingdom of God on earth were banished by the Spirit of God, and holiness replaced their imperfections, but no-taint of the slightest sin had to be removed from your virginal soul. He overshadowed you at the Annunciation and on Pentecost He made your heart a furnace of divine love.
Not only did the Holy Spirit pour into your soul a fullness of grace, but He entrusted to you, the Mother of the human family, the distribution of all grace. What was true of the effusion of the Holy Spirit on that day, is equally true of every outpouring of grace: God gives nothing to earth without causing the gift to pass through your hands.
Mary, My Mother, you always lived under the divine influence of the Holy Spirit and in the closest possible union with Him. Teach me to understand something of your love for the Holy Spirit and His love for you in keeping your soul beautiful and holy. Teach me to love Him with some of the love that glowed in your own heart so that my heart may always be His pleasing temple. Protect me from losing the Holy Spirit by sin. Make me ever attentive to His inspirations that I may grow in holiness and may merit to see this Divine Guest of my soul in the glory of His heavenly kingdom.
2. Mary, Mother of God, you are the Queen of the Apostles because you were the source of their inspiration and zeal. By your love of God and of His adopted sons, you aided the Apostles in the spread of Christ's Kingdom on earth. You could not accompany the Apostles while they fulfilled the duties of their ministry, but in silence and solitude, by the power of your prayers and the fervor of your charity, you were the master-missionary of them all.
The part that you have played in the spread of the Church and in its struggles and triumphs, clearly shows the Divine Plan in your regard. You have given to the world the Savior whom the Apostles have proclaimed. From you all missionaries have received the salvation which they bring to the nations. God has made you Queen and Protectress of the Church. You have the charge of keeping faith intact and love unimpaired in the Church founded by our Lord, and of spreading through the nations and over continents the knowledge of the Kingdom of God. Thanks to you, the grace and the sanctifying gifts of the Holy Spirit are scattered abroad over the Church and its members.
3. Mary, Queen of the Apostles, pray for the triumph of God's Kingdom upon earth. Through your powerful intercession promote the propagation of the faith. Give strength and courage to those who work for the salvation of souls as apostles of our own time so that following the example of the divine Missionary, Jesus Christ, they may labor zealously for the spread of God's Kingdom. Give them zeal that by prayer and sacrifice they may cooperate in the great work of the Redemption.
May your glorious example be imitated by countless youths and maidens who will give themselves to the Lord to carry on His work throughout the world. Increase the number of vocations to the priesthood and the religious life and awaken in many young hearts a zeal for the salvation of pagans and sinners.
Pray for more lay apostles, who in every walk of life will defend the rights of God, proclaim His Truth and preach His holy Will by word and example. Fill their hearts with the virtues of joyous zeal for God and for souls and a warm love for divine learning. Give me the same virtues in my state of life—a will inflamed with the desire that God's Will be done and a mind steeped in the knowledge of what that Will is. Give me enthusiasm and joy in the knowledge, the love and the service of the Lord.
Implore the grace of conversion for many pagans that they may come to the knowledge of the true faith and one day be united with the saints in heaven, there to love you and praise your mercy for all eternity. Bless our prayers and labors for the conversion of the world and support them by your powerful intercession with your Son, Jesus, that His Kingdom of Truth and Life, Holiness and Grace Justice. Love and Peace, may be spread among men.