On Monday, December 8 we celebrate the Solemnity of the Immaculate Conception, commemorating the day that Mary was conceived without the stain of original sin. It is the patronal feast of the United States and of the Diocese of Portland and it is a holy day of obligation. Most parishes have Masses scheduled for Monday, with a few also having vigil Masses on Sunday evening. A schedule can be found here: https://portlanddiocese.org/solemnity-immaculate-conception-masses-parish
