Box cake. Wrap box in 2 layers of saran wrap, 1 layer of foil. Put wrapped box in garbage bag. Place in freezer.
24 hrs. before serving, place completely boxed & wrapped cake in refrigerator. Several hours before serving, place boxed & wrapped cake on counter to come to room temp. Immediately before display & serving, remove cake from wrapping & box. Eat cake.
Rae
You want to make and decorate the cake three weeks before it's needed.
The only method to keep a cake fresh that long is by freezing it.
BlakesCakes describes how it's done (includes photos):
http://cakecentral.com/cake-decorating-ftopict-727723-.html
HTH
I wrap in 2 layers of saran and 1 layer of foil.
Rae
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