One, and only, big open-air concert I ever went to was Knebworth 1980. Headlining band was the Beach Boys, along with Santana, Devo, The Blues Band, but they may or may not have been there. We travelled from Cardiff in a converted ex-GPO Luton van (no windows, three sofas tied in the back, cobbled together intercom with those in the front), and one of the guys, Geoff Lewis, worked for Welsh Brewers so he cashed in all his 'dreymans coupons' to have the Luton well down on its axels with beer. Needless to say we were pi**ed when we got there and remained so for the whole event! Didn't really see the need to bother again after that, but each to their own.
Glad to hear that you survived Pat, and hopefully all that mud has made your skin oh so soft.....
Boyd