By the force of the Constitution the Ordinaries of places[27] have the faculty of permitting the saying of evening Masses in their own territory, should circumstances render this necessary. This holds true despite the command of canon 821, # 1. The common good sometimes demands the saying of Mass after midday: For example, for the workers in some industries who work their shifts even on feast days, for those categories of workers who must be on the job during the morning hours of feast days, like dock workers, and likewise for those who have come in great numbers and from considerable distances for some religious or social celebration, etc.
- Such Masses, however, may not be said before four o’clock in the afternoon, and may be celebrated only on the following definitely stated days. These are:
a. Holy days of obligation according to the rule of Canon 1247, # 1;
b. Feasts which were formerly holy days of obligation but which now are not. These are listed in the index published by the Sacred Congregation of the Council on December 28, 1919.[28]
c. First Fridays of the month.
d. Other solemn occasions which are celebrated with great gatherings of the people.
e. On one day of the week other than those enumerated above, if the good of special classes of persons should demand it.