Holy Days of Obligation are set by Canon Law (1246)
In some countries or dioceses, the Bishops may choose to suppress the day or transfer the day to the following Sunday (1246 section 2)
If there’s no Holy Day Mass then it’s likely the day was transferred.
Call your church and ask, or look on your diocesan website as it can actually vary by diocese.
Edited to add, I actually had a situation a few months back where the Bishop did NOT move the day (some other US bishops did, he didn’t) but whoever put the bulletin together forgot to list the holy day Masses. The Church was flooded with calls, including mine.