Is it sinful to miss the obligation of being at Mass for the Ascension?
I have a unique issue because I live on the border of two states, one that has Ascension on Thursday and the other that celebrates it on Sunday. If one were to go to Mass, for example in Maryland on Thursday, it would just be the 6th Thursday of Easter, not the Ascension. Then let’s say that same person decides to go to Mass in Pennsylvania on the following Sunday and there it is not the Ascension either since in PA(part of the Archdiocese of Philadelphia) it had already been celebrated that previous Thursday. Basically this person would be skipping the Ascension.
Since Canon Law says that the Ascension is a Holy Day of Obligation, would this person be committing a mortal sin by not attending Mass for the Ascension?