Don't make it too complicated bro. Dress nicely. Don't take off the jacket too soon. Me? I wear an undershirt because when the jacket comes off, you see the sweat on your shirt.
I just photographed a wedding last weekend for a good friend's family member:
-I left my cell at their house. No need for that at the wedding. (Different if you are not staying somewhere.)
-Leave your wallet at home. I took my money clip with cash/CC/bank card. That's it.
-Keys were also left at...