Well, here is my experience:
First off, my husband and I are devout, cradle Catholics. My husband has a very good friend who is a fellow black belt and also happens to be protestant (Church of Christ, the smallest of about three different kinds of CofC in our town of 40,000). Anyway, it came as a surprise (to me, anyway) that this young man asked my husband to be his best man. They are a very strict and very conservative denomination, not given to much hobnobbing with other Christians. So that was how we came to be involved very closely with this wedding. Which was held on April 8,… 2006.
Don’t reach for your calendars. It was on Holy Saturday of last year.
Well, we were in a bit of a quandary, resolved by my BIL (the priest), who, after ascertaining that the couple were entering a valid marriage; that nothing more than handing the groom the rings and signing the license would be required of my husband (i.e., no communion or anything like that); and that the reception was going to be just a sit-down dinner with no music or dancing, said my husband could accept this honor (and believe me, if you knew this young man, you would also see it would be an honor to be asked to be his best man.)
The actual problem came on the night before the wedding. The rehearsal dinner.
On Good Friday.
Now these folks are transplanted Texans (from Lubbock, no less). Texas dinners, by custom and by some obscure, but no doubt written-in-stone, rule are usually barbecue (I’m a transplanted Texan myself, so I know this is true
!) Well, maybe things are different on other planets, but around here, BBQ does NOT usually mean fish or any other kind of meatless entree. So in addition to the best man telling the groom to put off the rehearsal to a later time (because we were attending the Good Friday services), he also had to tell him that we meant no offense but we would not be able to partake of any meat during the rehearsal dinner because, as Catholics, we were obliged to fast and abstain on Good Friday (only he and his immediate family and his fiancee knew we were Catholic.)
It is a testament to my husband’s and this young man’s friendship that they were still friends at this point (although Sam–our friend–was probably wondering why in the world he asked this Catholic to be his best man
), and there we were on Good Friday, in the company of approximately 60 CofC Christians, preparing to eat only the coleslaw and the vegetarian beans, three Catholics MAKING THE SIGN OF THE CROSS before grace.
We blew our cover.
Anyway, the wedding itself was quite beautiful, about 20 minutes long. The groom’s brother and grandfather and the bride’s sister played the music (not “Here Comes the Bride”) and the family’s pastor (minister, whatever he’s called) read some Scripture and talked about Christian marriage. Then he asked for objections (there were none
!) and then he asked who gave the bride, then he had the couple hold hands and repeat their vows (she had to “love, honor and
obey”, he had to “love, honor and
cherish”, which raised a few eyebrows among the guests who thought those words were only uttered in the movies), exchange rings and kiss.
Everybody say “Awwwwww!”:clapping: Especially since BOTH the bride and groom were crying. It was very emotional. Then the couple walked back down the aisle and to the nearby reception hall (side note: this wedding did NOT take place in a church, but in a mountain retreat. There was a recreation room where the wedding was held, then a reception hall with a kitchen where the dinner was served up. And it was COLD! It had snowed the night before!) Anyway, that was only about the second Protestant wedding we’d ever attended (one the year before had been at an Assembly of God church… again, 20 minutes and we were outta there!)
Very nice, but I’m so glad we had a Catholic wedding with a nuptial Mass. I’ve wondered often if we’d known these friends back then if they would have even attended our wedding, let alone participated in it. They’re very quick to invite others to their services, but very leery of attending others’.
Seriously, I was raised evangelical. They last like 15 minutes, more if someone sings. 
All over in an hour, maybe hour and a half.