How far in advance can you decorate a fondant cake? How would you store it? I am making one for Friday night, it is Tuesday.
As long as your filling doesn't need to be refrigerated, the decorated cake would be fine for 2 days, so if you are baking today, decorate tomorrow.
It can stay on the counter in a cake box. If your filling is perishable, you'll have to wait for advice from others!