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The Solemnity of the Immaculate Conception is a Catholic feast celebrating Mary's conception without sin on December 8th. This feast day occurs in the liturgical season of Advent, which prepares for the birth of Our Lord Jesus Christ, the Immaculate Conception refers to the conception of Mary in the womb of her mother, St. Anne.
https://stmaryoldtown.org/come-celebrate-the-solemnity-of-the-immaculate-conception-at-the-basilica-on-december-8-2022/