I'm going to be doing a wedding cake (more like a groom's cake though) for next Thursday. It's going to be the Green Monster (a part of the Boston Red Sox ball field), covered in fondant with royal icing & fondant details with a gumpaste bride & groom on top.
I just checked out the weather & it's actually supposed to rain that day...but the temperatures are in the high 60's (we're in Massachusetts).
That should be fine, right?
If it rains, I'm thinking that they will have everything inside a barn (not your "typical" barn, LOL)
As long as it is under some sort of shelter it will be fine. In direct sunlight, even fondant can soften or melt.