In our observance of the Marian month we should take into account the season of the Liturgical Year which largely corresponds with the fifty days of Easter. Our pious exercises could emphasize Our Lady's participation in the Paschal mystery and in Pentecost with which the Church begins. The pious exercises connected with the month of May can easily highlight the earthly role played by the glorified Queen of Heaven, here and now, in the celebration of the Sacraments of Baptism, Confirmation and Holy Eucharist.
The following practices which are recommended by the Magisterium are offered as suggestions for honoring Our Lady during Her month.
The Regina Coeli – The ecclesial community addresses this antiphon to Mary for the Resurrection of her Son. It adverts to, and depends on, the invitation to joy addressed by the Angel Gabriel to the Lord's humble handmaid who was called to become the Mother of the saving Messiah.
The Rosary – Also called the Psalter of the Blessed Virgin Mary, the Rosary is one of the most excellent prayers to the Mother of God. Thus, "the Roman Pontiffs have repeatedly exhorted the faithful to the frequent recitation of this biblically inspired prayer which is centered on contemplation of the salvific events of Christ's life, and their close association with the Virgin Mother."
Litanies of the Blessed Virgin Mary – These consist of a long series of invocations to Our Lady, which follow in a uniform rhythm, thereby creating a stream of prayer characterized by insistent praise and supplication.
Consecration to Mary – The Roman Pontiffs have frequently expressed appreciation for the pious practice of "consecration to the Blessed Virgin Mary" and the formulas publicly used by them are well known.
St. Louis Grignon de Montfort is one of the great masters of the spirituality underlying the act of "consecration to Mary". He "proposed to the faithful consecration to Jesus through Mary, as an effective way of living out their baptismal commitment."
The Brown Scapular and other Scapulars – The scapular is an external sign of the filial relationship established between the Blessed Virgin Mary, Mother and Queen of Mount Carmel, and the faithful who entrust themselves totally to her protection, who have recourse to her maternal intercession, who are mindful of the primacy of the spiritual life and the need for prayer.
Medals – These are witnesses of faith and a sign of veneration of the Holy Mother of God, as well as of trust in her maternal protection.
The Church blesses such objects of Marian devotion in the belief that "they help to remind the faithful of the love of God, and to increase trust in the Blessed Virgin Mary."
Excerpted from the Directory on Popular Piety and the Liturgy