Would it be best to do a three tier cake with additional sheet cakes? I am pretty much limited to round pans (unless I hire them): I have a 12 and a 9 inch pan.
You could buy a 6" pan, then your 12", 9", and 6" double-layer cake tiers would serve 100 with sheet cakes for the additional 60 servings.
Hi Gabs. Ask the couple if they would like dessert portions, or only coffee/tea servings. You may not need as much cake as you think.