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It is the feast of the Assumption of Our Lady, the Blessed Virgin Mary.
Our Lady of the Assumption is a title of the Blessed Virgin Mary - the Mother of Jesus.
Because the glorious assumption of the blessed virgin Mary is a marvelous and wondrous thing. And we celebrate marvelous and wondrous things!
Solemnity of the Blessed Virgin Mary - January 1
Assumption - August 15
Immaculate Conception - December 8 (United States)
Feast of the Assumption of the Blessed Virgin Mary - this is a major feast day