The RHC ice cream cake is one of my favorites, everyone loves it to pieces. You could fill it with cherry vanilla ice cream. You can frost with gelatin stabilized whipped cream, which freezes perfectly, and the whole thing can be made and decorated ahead of time and then frozen until needed. Depending on how many layers/how thick it is, you’ll need 30-60 minutes out of the freezer before serving, especially if you’ve made it with homemade ice cream, which often has less air than store bought and freezes harder (maybe brandied cherry ice cream?).
Whatever you pick, I’m looking forward to seeing what you make!