Q: Are we permitted to celebrate St. Teresa of Calcutta at Mass on September 5?
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A: Yes. She is not on the US calendar, but you may celebrate a mass in honor of any canonized saint on that saint’s day as listed in the martyrology. The published martyrology isn’t updated yet to include her, but September 5 is her day. Use a mass from the Commons. For example, Virgins: One Virgin. Or Holy Men and Women: For Religious. Or For Those Who Practiced Works of Mercy.