I saw them at Anaheim Stadium in '72 or so. We had seats in the stands behind home plate, and they were outside the center field wall, and it was still just about the loudest concert that I have ever been to.
It was festival seating in the outfield, and a couple of my college buddies decided they were going out there to get closer to the band. They got caught in the crush, which was pushing people towards the outfield wall. There were a lot of announcements over the PA system about the danger of being smashed against the wall, yet people still kept pouring onto the field.
My friends were gone for close to an hour, and I figured that they had either been crushed to death, or arrested. Finally they showed back up, bruised and battered, but not seriously injured. They said that they had been forced closer and closer to the wall, and figured the end was near. When they finally got right up to the wall, they saw a a big crowd of bouncer types at the foot of the wall, hoisting people up to another crowd at the top of the wall. They themselves were grabbed and heaved over the wall like sacks of potatoes, where they hit the ground pretty hard. They then had to make their way around the outside of the stadium and back to their seating section.
It was a great concert. Oh to be young, good looking, and stupid again, unlike now, where I'm just good looking...