Question: what holy day of obligation is it today?
Answer: For the liturgical year of 2019-2020, the Solemnity of the Immaculate Conception is transferred to Monday, December 9th, 2019, and the obligation to attend mass is abrogated. In calendar year 2020, the Solemnity falls on Tuesday, December 8th, 2020, and is a Holy Day of Obligation.