Do I have to go to mass twice tomorrow (24th) if I was going on Christmas eve mass rather than Christmas Day mass?
The vigil Mass for Christmas is considered a Christmans Mass just as the Satuday night vigil Mass is considered a Sunday Mass. But you cannot go to a Christmas vigil Mass hand havd it count for both Sunday and Christmas. You are requried to go to a Mass for each day.
Fr. Vincent Serpa, O.P.