[adam]

I think weddings are challenging to shoot (for me anyway )
Especially since the bride is wearing white and the groom is wearing black, it makes cameras go crazy with the metering, so overexpose, so that your camera will underexpose it and you will be able to see the details in the bride's dress and she won't just be a glowing overexposed light (unless that's the effect you want) hehe

or something like that.
Please correct me if I'm wrong, I'm also here to learn and open to correction

backup camera might also be useful, just incase your camera has any problems