Attending a wedding = supporting the wedding?

Thanks for everyone's input and advice. For what it's worth, my Protestant family has been much more accepting and open-minded about my conversion (I converted five years ago). My fiancée converted two years ago, and her parents in particular have given her a hard time. They do, however, seem to accept that we are still Christians, and have asked me to pray at family dinners, which was an important gesture I appreciated a lot. When I converted, the person I was most concerned about telling was my Baptist best friend -- who had told me not all that long before (before I had any interest in it) that he didn't think Catholics were Christian. But he said that he believed my faith was genuine and that wherever I felt God was leading me, he would support me. That is the most I could hope from anyone.

Being married in the context of a Mass is very important to both of us, as an expression of who we believe we are, Christians whose union with each other is a reflection of Christ's union with the Church, and of what our marriage will be, a Sacrament. We understand there will be confusion about the Mass and probably offense about Communion being open to everybody. I plan to write a booklet explaining some of these things and hopefully to share them beforehand on our website. Our priest is likewise a convert from a Baptist background so I hope he can touch on these things irenically. I don't expect everyone in attendance to agree with or support all the Catholic particulars of the liturgy, but I do hope that at least some can appreciate its beauty, and appreciate the beauty of our gift to each other.