First, check a calendar. No, not the one with kittens. The liturgical calendar. If it’s a major feast that doesn’t fall on a Sunday, raise your eyebrows.
Second, ask yourself: “Did I hear about this at church last week?” If the priest reminded you, it’s probably an obligation. If he didn’t, you’re likely safe.
Third—and this is the best part—check your local bishop’s rules. Yes, your bishop can move or cancel Holy Days. In some places, the Epiphany is moved to Sunday. In others, it’s January 6th. Geography meets theology.
Quirky facts to impress your friends
Did you know that St. Patrick’s Day is not a Holy Day of Obligation? Even though everyone acts like it. The exception: if it falls during Lent, the bishop might lift the abstinence rule. You can eat corned beef on a Friday—praise be!
And the Feast of St. Joseph? March 19th? Also not an obligation. Except in some countries like Italy, where it’s a public holiday. Priorities, people.
What Are The Days Of Obligation In The Catholic Church | Detroit Chinatown
The most forgotten Holy Day? The Solemnity of the Most Sacred Heart of Jesus. It’s a Friday, often in June, and almost no one remembers. Even the calendar seems embarrassed by it.