I accidentally did a two-tiered, time-consuming cake two weeks early a couple of years ago.
Instead of doing it all over again, I used a moving box from Lowe's to box the cake (fondant bows, gumpaste elements, royal icing piping, buttercream under fondant). I wrapped the box entirely in plastic wrap, then in foil, and put it in the freezer. I took it out of the freezer and put it in the fridge the evening before the event. On the day of delivery, I prayed and unwrapped it. It was absolutely perfect. Not one thing went wrong, amazingly. :D I use FondX, though. Not sure how MMF behaves.
It was this cake. Someone suggested freezing it whole so I did. And no one ever knew. Until now. :D http://cakecentral.com/g/a/1971345/sweet-little-lambs-baby-shower-cake/