This will be my first big cake, 85 people are coming. No pressure or anything, but my other cousin (the birthday guy's son) was a professional cake decorator for decades. He recently sold his shop though and moved to another state so logistically he can't make it.
My cousin offered to pay me for the cake, but I declined. I'm a hobbyist baker and I'm really honored to gave been asked.
Any suggestions would be welcome! For a tiered cake of rounds, how do I know what sizes to do to feed 85 people?