Bride, Groom, Maid of Honor, Best Man, Mother of the Bride, Wedding Coordinator (if applicable).
(i.e. items you hand made, family memorabilia, sentimental items, details unique to the bride and groom's personalities, etc.)
(i.e. the groom will sing the bride a song at the alter, signing of the marriage certificate during ceremony, etc.)
(i.e: photos in front of the red barn are a must!)
The more info I have about your wedding, the more prepared I can be when photographing it.