Once upon a time, my pal Gary Sassaman was heavily involved in the planning and execution of Comic-Con International. Over on his blog, he's been posting some wonderful stories about his experiences. The latest installment — which you can read here — is about dealing with big stars and big studios who wanted to do big promotions of big movies at the big convention.
If you like it, you'll want to go back and read earlier installments and this link will help you get to them. The earliest ones are about what Gary did before becoming involved with Comic-Con and those are worth reading also.