A search for "bris" in the Digital Tradition brings up one song, the aptly-named A Little Bit Off the Top. Lots more mentions of "bris" in the Forum, but I don't have time to search through them all just now.
MG, the Feast of the Circumcision of Christ, January 1, is still celebrated. It is now primarily known as "The Solemnity of Mary, the Holy Mother of God" and by its oldest title, the "Octave Day of the Nativity of the Lord."
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sj