Can one Mass meet two obligations?

[Psalm4]

Recently I went to Mass on a Saturday evening. That Saturday was a holy day of obligation. I figured the Mass counted for both the holy day obligation and the Sunday obligation. A relative of mine who I later told disapproved and said I should have gone twice. Was what I did wrong?

 

[Michelle_Arnold]

Yes. When a holy day falls on a weekend and is not dispensed, then Catholics must attend two Masses, one for the holy day and one for Sunday. But since you did what you thought was correct and did not intend to skip one of the obligatory Masses, you did not sin.