Prayer for the canonization of
Blessed Bronislava
O
God, who hast chosen Blessed Bronislava, so that
by her wondrous virtues our hearts may be drawn closer to Thee, deign to
glorify Thy faithful servant as Thou didst during the past centuries by
granting requests, favors and miracles through her intercession.
Grant also, we beseech Thee, that by new miracles Thy chosen spouse may soon be elevated to the honors of the altar for the glory of thy Holy Name.
Amen
Holy Days of Obligation

Holy days of obligation are days of the year
when Catholics must attend Mass, in addition to the normal Sunday
mass. The United States has six holy days of obligation:
January 1: The Feast of Mary - Soleminity of Mary, the Mother of
God
40 days after Easter Sunday: Ascension Thursday
August 15: Assumption of Mary into heaven
November 1: All Saints' Day
December 8: The Feast of the Immaculate Conception
December 25: Christmas, The Nativity of Our Lord
If certain holy days fall on a Saturday or Monday, they aren't considered holy days of obligation, because the are back to back with Sunday.
In the United States, however, Christmas Day (December 25) and the Immaculate Conception (December 8) are always days of obligation even when they fall on Saturday or Monday. The reason is that Christmas and Easter are the highest ranking holy days, and the Immaculate Conception is the patronal feast for the United States.
If in doubt, it's best to call the parish, or just go to Mass anyway, Attending Mass is never a waste of time, even if it ends up not being a holy day of obligation.
Note: Europe has four more holy days: January 6 (Epiphany), March 19 (St. Joseph), Corpus Christi (Thursday after Trinity Sunday, which is the Sunday after Pentecost, which is 50 days after Easter), and the Solemnity of St. Peter and St. Paul (June 29).
Holy days are like Sundays in that Catholics
must attend Mass, and if possible, refrain from unnecessary servile
work. Some Catholic countries, such as Italy, Spain, and Ireland, give
legal holiday status to some of these holy days, so people can attend Mass
and be with family instead of at work. -
excerpts from Catholicism for Dummies Wiley
Publishing Inc., 2003 page 154