301. The Mass of a feast, in the proper sense, is understood to be the Mass of the mystery, saint or blessed celebrated according to the order of the office.
[…]
475. After the gospel or after the homily, the creed is said:
a) every Sunday, even if the office of the Sunday yields to some feast, or a votive Mass of the 2nd class is celebrated;
b) on feasts of the 1st class and in votive Masses of the 1st class;
c) on 2nd class feasts of the Lord and of the Blessed Virgin Mary;
d) throughout the octaves of Christmas, Easter and Pentecost even on the occurring feasts and in votive Masses;
e) on the birthdays of the apostles and the evangelists and on the feasts of St. Peter’s Chair and of St. Barnabas, apostle.
476. The creed is not said:
a) in the Chrism Mass and the Mass of the Lord’s Supper on Thursday of Holy Week, and in the Mass of the Easter vigil;
b) on feasts of the 2nd class, except those listed above, nos. 475c and e;
c) in votive Masses of the 2nd class;
d) in festive and votive Masses of the 3rd and 4th class;
e) by reason of any commemoration occurring in the Mass;
f) in Masses of the dead.
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