See additional information and pictures of the Consecration in the Cathedral of the Immaculate Heart of Mary, Las Cruces here. 

[Wikipedia] The Annunciation is a painting widely attributed to the Italian Renaissance artist Leonardo da Vinci, dated to c. 1472–1476.^{[n 1]} Leonardo's earliest extant major work, it was completed in Florence while he was an apprentice in the studio of Andrea del Verrocchio. The painting was made oil and tempera on a large poplar panel and depicts the Annunciation, a popular biblical subject in 15th-century Florence. Since 1867 it has been housed in the Uffizi in Florence, the city were it was created. Though the work has been criticized for inaccuracies in its composition, it is among the best known portrayals of the Annunciation in Christian art.

The Feast of the Annunciation, which is celebrated on March 25 every year, goes by many names. It is known as the Solemnity of the Annunciation, the Feast of the Incarnation, Conceptio Christi, or Lady Day. It is a Christian holiday commemorating the visit of the angel Gabriel to the Virgin Mary, where he announced that she would give birth to Jesus Christ.

The Feast of the Annunciation cuts across many factions of Christianity, but it is specially celebrated in Catholic, Orthodox, Anglican, and Lutheran churches. The holiday is counted as one of the eight great feasts of God in Orthodox Christianity, and it is a major Marian feast.

The angel’s pronouncement is met with Mary’s willing consent (“Here am I, the servant of the Lord; let it be with me according to your word”), and thus precipitates the Incarnation of Christ and his redemption of the world.... The Feast of the Annunciation, one of the principal feasts of the Christian church, is celebrated on March 25 (Lady Day), nine months before Christmas. The first authentic allusions to the feast (apart from the Gelasian and Gregorian sacramentaries, in both of which it is mentioned) are in acts of the Council of Toledo (656) and of the Trullan Council (692). Because its significance is much more than narrative, the Annunciation had a particularly important place in the arts and church decoration of the early Christian and medieval periods and in the devotional art of the Renaissance and Baroque. [Britannica]