Bake the cake today.Cover it well after it's totally cooled and put it in the frig.Frost it tomorrow.Enjoy.
ALWAYS bake the cake the day before because it must be completely cool (at least 3 hours) before you frost it. It will be plenty fresh.
make it today and put it in the fridge after it cools that way if you decide to eat outside you'll have a cold treat.
Make the cake today, but the frosting tomorrow. Nothing is worse than hard, refrigerated frosting.