To fulfill your obligation to go to Mass on a given day, you must physically attend a Mass in any Catholic Rite on that day. It doesn’t matter what feast is being celebrated, if it is Latin Rite, Eastern Rite, or whatever. If it is technically speaking a valid Catholic Mass during the time frame for that liturgical day, it fulfills the obligation, regardless of any other circumstances (the Rite the Mass is in, the particular celebration of the day, any abuses, etc.). So Mass on Saturday evening fulfills the obligation since Sundays on the Church calendar are longer than 24 hours. The same is true for Holy Days of Obligation & their vigils.
[Edit: Essentially, if you are obligated to “go to Mass on Sunday”, then that means that you must “go to an actual Mass on Sunday” in the literal sense of the term.]
In regards to what readings are done at a Confirmation, it depends on what the rubrics say. Confirmation Masses are Masses of the Holy Spirit, but if it is done on Sunday, then the bishop (or priest with authority from the bishop) can celebrate either the Mass of the Holy Spirit, or the Mass of the Sunday. We could possibly be here for a while if we want to get into the details.