The Virgin of the Immaculate ConceptionEl Greco [Web Gallery of Art]
The Solemnity of the Immaculate Conception, observed on 8 December, is a holyday of obligation in many countries, eg, Ireland, the Philippines. This year it falls on the Second Sunday of Advent, which takes precedence over it. So the Solemnity is transferred to Monday 9 December. However, the obligation to attend Mass does not carry over.
Readings (New American Bible: Philippines, USA)