Queen of Peace
The Solemnity of Mary, Mother of God is a liturgical celebration observed on January 1st.
The use of the word “Solemnity” here is a designation used for certain days within the liturgical (church-based) calendar of the Church. Solemnities are the highest rank of liturgical celebration, higher than feast days or memorials. By celebrating a solemnity dedicated to Mary’s motherhood, the Church highlights the significance of her part in the life of Jesus, and emphasizes that He is both human and divine.
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It is a holy day of obligation for Catholics, meaning that Mass attendance is required (though the Mass obligation is sometimes waived by the bishop for various reasons; when in doubt, check with your parish.)