I agree with Paperfishies. After the first time you should have a better grasp for how many cupcakes to make. When weather gets hot sometimes frosting melts. I don't know if dry ice would help in a cooler or not. I am sure others here will have a solution for the hot weather issue. Good luck and I wish you lots of sales. Most people love cupcakes!!!! If I was in a market and saw cupcakes I would head right on over and buy me one or a few!!!