Harry Potter: The Exhibition was in Sweden during the Summer last year, very close to my town as well! I attended two times, wishing still I had been able to gone at least one more time. You could only photograph without a flash so the quality isn't the best. But on the other hand the first few months you couldn't photograph at all but it changed due to much complaining from the public so it's fine.
Have you been to the exhibition? What did you think of it?