TS credit allowed for fireworks dessert parties?

Are dining plan credits allowed for fireworks dessert parties or it is extra prepay only? Also, if it is extra prepay only, does anyone know if this is refundable in case “something” happens and we don;t make it there?

You cannot use dining credits to pay for the dessert party. You are correct that it is prepay and I believe they have a 5 day cancellation policy.