It’s my boyfriends mums birthday next Friday and I would like to make her a cake (we live together Im not randomly sharing food during pandemic) but I am at work all week. Can I bake it today then leave it until Thursday to decorate it or will it go stale? I did read about baking the sponge and putting it in the freezer but I’m not sure whether this will taste as good? Also does anyone have any tips for getting butter cream smooth around the edge and over the top of a cake? I have an icing smoothing tool but I’m not sure I’m getting the technique right based on previous cakes I’ve made? Thanks!