Calendar Add to Calendar Add to Timely Calendar Add to Google Add to Outlook Add to Apple Calendar Add to other calendar Export to XML When: December 8, 2023 all-day 2023-12-08T00:00:00-06:00 2023-12-09T00:00:00-06:00 Epiphany Immaculate Conception, Roman Catholic dogma asserting that Mary, the mother of Jesus, was preserved free from the effects of the sin of Adam (usually referred to as “original sin”) from the first instant of her conception.