I was at a bridal faire today. It occured to me that most people outside of Utah don't know how different things are here in Utah regarding weddings. After living here for 12 years, here are some of the differences I have seen. It kind of puts stuff into perspective because what you should be at our weddings is really just cultural influence and a result of where we happen to live (if we were in Afghanistan we'd be concering ourselves with a whole different list of things). So I just have to laugh at so many etiquette rules, when it's really just geographical.
Temple marriages have few guests (maybe 50 depending on the sealing room size of that temple), and every adult must be a temple card holder (aka worthy Mormon). No kids watch the ceremony (aka temple sealing). Seals you together for time and all eternity. There is no "til death do us part." No rings are exchanged. Couples can exchange rings at their reception which is mostly done for the non-temple guests.
If your child is getting married in the temple and you are not a temple card holder, you cannot watch them get married.
No photography is allowed in the temple. The money shot is when the couple exits the temple holding hands where they are greeted with people who weren't at the ceremony or allowed to go in the temple (like me, they let me inside the gournds though!).
Receptions are usually 2 hours long and always during prime meal times aka, (at least to the ones I've been to). Usually a beverage and a sweet in the church gymnasium. The couple doesn't really mingle much, they stand in their receiving line. Guests line up to greet them, have some cake and then leave! I haven't seen any dancing yet. $25 gift seems to be the norm I've been advised. Some couples have more than one reception depending on how far your hometown is (aka another state). Brides usually wear their dress again.
There's always a wedding luncheon the day of the wedding with only close family and friends. They don't have rehearsal dinners. Although they might have bridesmaids, BMs do not do have anything to do with the ceremony. Temple ceremonies are very religious and do not involve wedding parties (aka no processional, no one stands up there with you).
Some start Facebook events with, "If you want to get a reception invitation leave your address here!" and they literally send out 500 invitations (no RSVPs), which is an invitation to the cake and punch part only. These invitations pretty much always have an engagement photo on them. Every Utah wedding vendor assumes you will also want a photo to put on your wedding invitation.
No veils, tuxes, or hats are allowed in the temple. Gowns are modest. They have to cover all of the bride's temple garments which are basically like a capped sleeve Tshirt with a square neck. They are issued these garments while in the temple to wear next to their skin at all times (the garment bottoms replace regular underwear, and your bra must be worn over the top of the shirt).