I've just been talking to a friend who went to the cinema to see the performance. Believe it or not, her ticket, which she'd bought a few weeks ago, had 17.30 printed on it as the start time. Luckily she'd arrived very early as she wanted to have a meal before the performance started, so she found out in time that it was incorrect. She said that judging by the number of latecomers a lot of other people did get caught out though.