Now it’s important to remember that if you’re doing a layered cake you can do each layer a different flavor but they might contaminate each other so if you have a guest with a particular allergy it’s always a good idea to keep a vanilla sheet cake in the back not on display to your guests. It’s also important to remember that the cake you display which might only feed a smaller amount of people does not need to be your only cake, just as in the case of allergies you can keep that sheet cake in the back to be cut and served.
Also good to note: If this is your wedding you also might be keeping your top tier of your cake to save for your first anniversary which means you shouldn’t consider that tier when doing your servings math for your guests because you will not be serving it.