Because Palm Sunday and the beginning of Holy Week occurred on March 25th, the feast of the Annunciation of Mary had to be transferred to today, April 9th.
The Archangel Gabriel was sent from heaven to ask the Virgin Mary to be the Benefactor of the human race. She was to be the chosen method and the chosen Woman who would enable God to become a member of His created human race.
The Eternal Son of the Heavenly Father elected to be born of a human mother to rectify the disaster of Adam and Eve's mortal Fall in the Garden of Eden. He chose the title of Messiah and the name of Jesus, the Saviour. His human Mother Mary would be his most faithful companion, in working out our restoration to a right relationship with our Creator. If ever two lives were bound up together in thought and purpose and love, it was the lives of Jesus and Mary. From the moment of Mary's YES to the angel Gabriel, the Holy Spirit infused the created soul of Jesus into the miraculous Body being formed in the womb of Mary. Their Union did not cease at Jesus's birth, but their communion of mind and heart continued to deepen through all the great moments of Jesus's life on earth right up to his Cry of death on Calvary.