First, I want to say thanks to everyone here that answers questions for us newbies. I feel like all I do is post question after question, but you all are gracious to answer. I hope that some day, I will be on the answering end.

I am giving a cake to someone on Saturday, but their party is not until Sunday.
I wanted to fill, ice and stack the cake on Friday, and then decorate it Saturday.
Will it still taste good on Sunday?
How should I store it after it is filled and iced? Please read my filling recipe and tell me if it needs refrigeration if it is going to be out 48 hours.
(From Martha Stewart)
1/2 cup butter
1 1/2 cup conf. sugar
vanilla, raspberry jam

I am baking the cake today, but will put it in the freezer until Friday evening (then I will thaw it before I fill and ice it)

If it does need refrigeration, is that the best way to store the cake, or will it make it dry by Sunday? Would the cake/frosting still taste good Sunday if it is left out 48 hours if it does not need refrigeration?

It does not need refrigeration
I would remove cake from fzr Thurs evening or Fri a.m. so it has time to thaw. Depending on the size of the cake it could take from 1 to 10 hrs. If you add crumb coating to what you do fri it seals the cake so you don't need to frig it. It will not dry out at all.

OK, so there is enough sugar in the filling to make it OK for 3 days outside the frig?
So, Friday, I torte, fill, crumb coat, ice, and stack the cake, then Saturday I decorate it, and Sat night it is picked up, and Sunday it is eaten and will be moist, safe, and delicious?
Sounds too good to be true!

I never refrigerate my cakes. Cakes are not as fragile as people seem to think. Think back to your mom or your gramma putting that leftover cake under the glass dome, sitting in the corner of the counter for days and days until it was finally eaten up.

Days and days.