Copticruiser, sorry for gooch's answer. You don't have to go to confession as there's nothing to confess.
Yes, you can go to a protestant wedding, funeral or baptism as a guest. You just may not participate in it. In other words you couldn't be the bridesmaid or pall bearer. Sorry I don't have references but that's what we were taught way back before Vat. II. I've never heard about the Sunday thing. I don't see why you couldn't go as long as you go to Mass first. You couldn't go to the protestant service in lieu of going to Mass on Sunday. Hope this helps. Maybe someone else can provide references. I just wanted to give the short answer so you wouldn't be worrying.
I'll admit this is not a clear cut issue, it's a tough one
tell me if you 're so sure of yourself after reading this articlehttp://www.latinmassmagazine.com/articles/articles_2006_AC_Allan.html
this was my last post from the other thread, no one responded to it
The Holy Office on Worship with Non-Catholics from 1622 to 1939
Hence, the Holy Office forbade Catholics to go to the funeral of non-Catholics, except from a causa civilis,28 i.e. from a civil cause. By this, it appears we are to understand that only those who hold a civil office or a position of prominence within a civic community could go to the funeral of a non-Catholic.
As for Catholics going to the marriages of Catholics being married outside of the Church, the Holy Office says this is forbidden by virtue of law (regula). However, it may be tolerated for a causa civilis,40 and provided that, scandal being removed, there is no perversion of the Faith or contempt for ecclesiastical authority.41 This meant that unless one had a civil cause, one was forbidden to go to the wedding