That's a beautiful cake!
The only time I ever have fondant sweat is when the cake has been in the fridge.
Mine don't sweat in the fridge...they sweat when they've been out of the fridge....I'm not sure how to stop it though...sorry
I believe that's what Texas Rose meant.. when you take them out of the fridge.. they sweat.
It's inevidible I'm afraid. Like anything you remove from somewhere cold and place somewhere warm and humid, a cake is going to sweat as the moisture in the air condenses on its cooler surface. Given enough time though it will dry. I find it's best to bring your cake to room temp before taking it outdoors. I place the cake in an air conditioned room and then turn off the AC and then when they cake is to temp take it outside. The closer the cake is to the outdoor temp, the less chance you will have for the condensation.
That is your FIRST fondant wedding cake? It looks perfect & beautiful!! I think the others covered it for the sweating, but if the "sweating" is what caused it to look more shiny in your picture, I think it looks great!
Thanks so much for the input. I guess I'll just have to hope for no more outdoor weddings until Fall.