What is the name of the concert held in California that was a copy of Woodstock?

Question

It hired h***s Angels for security and was a huge disaster.

Answer 1

That was Altamont. It was a free concert given by The Rolling Stones to celebrate the end of their US tour.

Answer 2

Altamont. There is a video. The Stones asked the Angels to provide their security. In return they furnished them with free barrels of beer as payment. A man in the crowd was stabbed and killed. (It's on the tape.) The concert location had to be changed at the last minute and the facilities were inadequate (a dusty racetrack). John Phillips of the Mamas & Pappas was a main player.