Just found your excellent site which brings the memories 'flooding' back.

I was 17 at the time and had hitched down from Nottingham. We didn't really know what to expect but I don't think anything could have prepared us for that weekend.

I lived on coke and those wretched hot dogs all week end. When I arrived home my lips were black and sore from all those smokey fires which burned throughout. But it was well worth the hardships.

The performance I remember most was Johnny Winter. I've not noticed anything which mentions that brother Edgar was in the band.
 I've found a couple of crowd photos which are attached.