Event timings are a bit tricky, especially for really big events. The event organisers sometimes don't know themselves until they've done the soundcheck on the day and even then, things can change at the last minute.
If the timings are confirmed in advance, we'll email you to let you know. A lot of venues work to a curfew, so it can be a good idea to check their official website for details if you need to arrange your travel home.