Little known fact about woodstock and Hendrix. He was obsessed with being the last act. He didn't want anyone to upstage his performance. So, by the time everyone was done playing and jamming and doing drugs and whatever, it was Monday morning when jimi took the stage. He woke the now >50k crowd with the rendition of the star spangled banner.

It wasnt 500K people, but the point still stands. I'm sure there wasn't anyone kneeling.