I went specially to Birmingham for the BMX and although it was not as exciting as I imagined, I still really enjoyed the experience. Well worth it, especially if you are do not need to travel.
The only slight annoyance was they handed out Boom Boom or clap sticks. I had a girl behind me who banged them together, and off my head, for five hours straight. I had a throbbing headache. Her father was useless.