From a reader:
A local parish has a Spanish-language Mass on Monday night, but uses Sunday’s liturgy. Is this ever allowed, even with a dispensation? If so, would it fulfill one’s Sunday obligation? It seems very strange to me.
When there is no saint or other feast celebrated during the week days, you can use the previous Sunday’s Mass formulary, though you wouldn’t use the Gloria or Creed or Sunday Preface and you use the proper readings assigned for that week day.
However, you don’t fulfill your Sunday Mass obligation on Monday, right? You fulfill your Sunday obligation on Sunday, or the Saturday evening which – liturgically speaking – is already considered to be Sunday.