According to Canon 1247:
"On Sundays and other holy days of obligation, the faithful are obliged to participate in the Mass.
Moreover, they are to abstain from those works and a[ff]airs which hinder the worship to be rendered to God, the joy proper to the Lord’s day, or the suitable relaxation of mind and body."
It occurs to me that one ought to take the day off from work if possible, if a Holy Day happens to fall on a normally scheduled work day, such as happened on Ascension Thursday in my diocese. Am I mistaken?