Here is a recycled post from 5-years ago:
According to tradition the childless Joachim and Anne, received a message from an angel that they would have a child. In fulfilling a vow for the gift of their daughter, they brought the three year old Mary to the Jerusalem Temple so that she might be consecrated to God. Tradition tells that Mary remained in the Temple until twelve years of age, at which point she was assigned to Joseph as guardian. The tradition also says that she remained in the temple to be educated in her role as the mother of God. The presentation of Mary reemphasizes the holiness of Mary as Mother of God, an importance commemorated by the feast of the Immaculate Conception. This memorial of the Presentation of Mary celebrates Mary’s dedication to God from her infancy, through the Holy Spirit, who filled her with grace at her immaculate conception. Mary’s role as mother of God did not begin with the Nativity of Christ, it begins with her immaculate conception and was strengthened at her temple presentation. In presenting herself to God and accepting Gods plan for her, she was able to accept the annunciation and all that follows. In that she is the image of church, the new temple. Through the presentation she accepted and prepared for her role as Mother of God. In a sense this is the beginning of Mary’s Advent as presenting oneself before God is the first step to receiving the Christ of the Nativity. Advent begins in 16-days.