I know that this is not what you asked for help on, but just so you know, the 14th is a Friday.
My personal preference for large shots like this is to light evenly from both sides if you can manage two flashes with diffusers. Secondly, I love the look of a dark green background (but in the distance so that the details disappear somewhat.) Obviously that will depend on the location. If it is early enough in the morning light, you can place them in full sunlight at maybe a 45 camera right and fill with a flash at 3/4 stop lower to lessen the contrast. The blue of the sky should really pop with that (if not overcast that day)