If it’s for Friday you are okay to cover with ganache today. But make sure if you are using mousse or fruit to keep it refrigerated. I know some decorators like to keep their cakes out but I always refrigerate mine regardless of what the filling is. And yes, simple syrup will keep your cakes moist. I work in a bakery and they always use simple syrup on their cakes and I have started to use it in my cakes as well.
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