How big is your oven that it can only bake 12 at a time? You can do them ahead and freeze them if you're desperate, but i'd get advice from people who have done that before. I don't do cupcakes so I don't know how the wrappers will be affected by freezing and thawing. You could plan on using some of those cupcake liners that you slip on over the wrappers you bake them in, in case the ones that you bake them in separate from the cupcakes.
Hi - I bake and freeze cupcakes all the time and they come out fine. Just defrost while wrapped and they'll be fine.
Thanks very much guys. I think i will make ahead and freeze.
That's going to be 30 batches. Are you going to have room to freeze and store that many frozen cupcakes?