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Keep it in an airtight tin or box, somewhere cool, but you don't need to keep it in the fridge, unless you live somewhere that's warm and toasty at the moment.... Room temp is fine
Kristen is the Creative Director of Food52
If you keep it in an airtight container and wait to frost till Sunday, you should be fine. You could also consider freezing the cake now and taking it out in the morning on Sunday to defrost, then frosting it.
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