Is there a specific reason you can't put the fondant cake in the fridge? I do it all the time.
No too much, in a freezer YES in a frig not too bad if you keep it in a cool place. I keep my house at 65 and it is never a problem. Be really careful about cream cheese icing it can be a p.i.t.a. be sure to use the recipe found here. I used the regular recipe, cream cheese, butter,powdered sugar, vanilla and it just is a beast to work with using fondant, I was warned but thought a better flavor was more important. The second tier on the last wedding cake I posted. THE BUMPY TIER as soon as it got the slightest bit warm it drooped, even after settling for 5 hours!
Use a crusting cream cheese that is found here. I think the crucial missing word in the above post was *crusting*. 
It all depends on the fondant, i've found that most do pretty well in the fridge, I use MFF and have no problems, and I know tons of people put MMF in the fridge without problems. It also depends on comercial or regual fridge and boxed or not etc. You just gotta find what works for you. Good luck!
Quote by @%username% on %date%
%body%