I did chuckle at this.
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You should be fine if you arrive at 15:30, but a safer bet will be to go at 15:00. It will get much busier as it gets to the time for the final bus to leave. They then drop you off at a point at the stadium, you go do your thing until showtime, then you pitch back at the same spot and take the right bus to where you parked your car. People are pretty friendly, so if you're unsure about something whilst on the bus or looking for the right bus, ask the info staff, they are all over the show there.
Agreed, get there earlier and when you get to the stadium have a beer and roll, chill till the start of the show and enjoy the atmosphere. I know some guys get there at 2 and a good parking spot, then go for lunch at north gate before setting off on a later bus.
Busses will be have a name on the front saying where it left from, easy enough to find yours.
I am hungreh, time to feed.