Hi Tim,
Hope you're getting your program sorted out & you now have a list of songs in mind....
You mentioned that it will be a garden wedding, & therefore you will be playing outside....a thought that crossed my mind was, PRACTICE outside.....if you are used to the sound of your keyboard inside a room, you will find it will sound quite different away from the confines of walls....you will hear different accompanying instruments than you normally do & it can be quite distracting until you get used to the sound....& you certainly don't need distractions for what should be an enjoyable time for you....
So if you can, play outside a time or two before the big day....
Hope it goes well for you..
FlutteringBy