I found a chapter on Mormon wedding etiquette in "Manners Kids Should Know" book. This part was very interesting...
"At this formal ceremony (the temple marriage), the bride wears a white gown and veil even though she's been married (civily) before. Your child should dress up too."
About the reception:
"this may be a large affair, so your child should be prepared to exercise patience."
If only I knew this 63 wedding receptions ago! :)