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What are holy days of obligation?
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In short: A handful of big feasts each year when, like Sunday, Catholics go to Mass. CCC 2177 CCC 2180
The answer, in writing
Sunday is the foremost holy day of obligation, and certain other feasts are also to be observed. CCC 2177
On Sundays and other holy days of obligation the faithful are bound to take part in the Mass. CCC 2180
In the U.S. the list includes Christmas, the Immaculate Conception, the Assumption and All Saints, among others. Your parish bulletin will remind you.
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