The Holy Day of Obligation reference article from the English Wikipedia on 24-Apr-2004
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Holy Day of Obligation

In the Roman Catholic Church, the Holy Days of Obligation are the days, other than Sundays, on which the faithful are required to attend Mass. The 1983 Code of Canon Law standardized ten days to be observed as Holy Days of Obligation throughout the Church. These days are:

Table of contents
1 Observation by Country
2 See also

Observation by Country

The conference of bishops in a particular country or region may suppress the observance of these days, or transfer it to another day, with the permission of the Vatican. They may also make the feast day of county's patron saint a holy day of obligation.

Australia

Canada

England and Wales

Ireland

United States

See also