It was said after it that if you remembered the SOL'67 then you didn't really experience it. That was the drug heads talking, I beg to differ. I remember it well, and three important music icons who were lost in '70 & '71 because of them (all at the ripe old age of 27)... Jimi Hendrix, Janis Joplin and Jim Morrison.
I remember the Byron Pop Festival around 1970. It was a really big deal with something like 500,000 attending. I was there! Our band decided to go and see what famous bands sounded like. We were impressed. Of course, we decided that any decent band would sound good with the huge sound system on that stage!