I'm sorry I got distracted by the troll
But I did have a marriage ceremony with my ex-husband 12 years ago. I didn't know I had SA or depression at the time, and I think I just focused on the ceremony rather than the fact that friends and family were watching me. I don't usually get too nervous in situations like that though, where there's structure and/or a script. It's impromptu social interactions that I can't do very well.
Edit: To answer Luke's question, it was pretty much luck I guess. My ex was a coworker of my college room-mate, and he was outgoing enough to really pursue me despite my extreme shyness. Again, I didn't realize I had any "disorders" at the time, so there was no big "reveal," I was diagnosed with depression and SA after we were married a few months.