I am making a stacked cake covered in buttercream that does have butter in the frosting and plan on putting MMF fondant strips and stars on it! My question is how do I store it for a party tomorrow! I really want to put it in the fridge but I was worried how the fondant decor will handle it! It is 100 degrees here and unfortunately my ac is not to great with this heat so it is really hot in here so would prefer the cake be in the fridge if possible!
It's not the putting it IN the fridge that's the problem - it's the taking it out. If it's hot, I'm assuming it's also humid (lucky for you if it's not!). The problem is the condensation that will form on the cake when you take it out of the fridge, but if you have enough space, there is one thing you can do to avoid this problem: put your cake in a box and wrap it airtight in a layer or two of plastic wrap. When you take the cake out, let it come to room temperature without unwrapping it. When the condensation has dried out on the outside of the box, you'll know it's safe to remove the plastic wrap and take it out of the box. A suggestion for next time: find yourself an all-shortening buttercream recipe - it stands up to heat a lot better than butter does and it can be delicious (see IndyDebi's buttercream in the recipe section here, for example).