Holy Days of Obligation are six days a year on which all Catholics are required to attend Mass. If the Holy Day falls on a Saturday or Monday, the obligation to attend Mass on that day is removed, and the Holy Day is celebrated on that Sunday.
Every Sunday is a Holy Day of Obligation in the sense that Catholics are required to attend Mass every Sunday.
Friday, January 1: Solemnity of Mary, Mother of God
Sunday, May 16: Ascension of Jesus ( permanently transferred to the 7th Sunday of Easter in Florida)
Sunday, August 15: Assumption of the Blessed Virgin Mary
Monday, November 1: All Saints Day
Wednesday, December 8: Solemnity of the Immaculate Conception
Saturday, December 25: Solemnity of the Nativity of the Lord