Reading festival

I’m taking my son,16, who has CP to Reading festival next week, along with his two non-disabled mates. Has anyone been recently and do you have any tips if so? He uses a wheelchair but can walk short distances. We’re camping in the disabled campsite and I was wondering if you can use electric hook ups there. Also, how difficult is it to get onto viewing platforms and can you take a wheelchair into the crowd if necessary. Cheers.