I don't like to show weddings, generally because they're so alike. White dress, long veil, flowers, vows, rings, kiss, cake, etc. If you're going to do it, make it unique and interesting.
When I married my characters in my first novel, it was a secret wedding in the middle of the night, so it started off as unusual. I deliberately didn't show the ceremony, because there's only so many ways to say, "I do." I led up to it, then I skipped ahead to, "It was done."
My second novel, I ended with the proposal, rather than the wedding, for the same reasons.
My third novel kind of skips the issue--it's set in the distant future on a colony world. The guy's telepathic and when he sleeps with someone while initiating a mind link, it bonds them forever, so that effectively marries them. There are some problems because the girl's government doesn't recognize the validity of such a union and therefore considers her unmarried. The couple might have some kind of official binding ceremony back on his world, once everything is resolved, but I haven't reached that point yet, so I don't know for sure.
Like with any cliche--turn it upside down and own it. Make it yours!