One Helluva Line-up.

Zepp, Joe Walsh and Pretty Things on one bill? Hot damn kilogram! Can you imagine how much spit was swapped amongst groupies after this show? How many TV's were flung from hotel windows? How many faces were melted into pools of unrecognizable DNA?

Well, it never happened. This show was canceled because Robert Plant suffered a severe leg injury in a car crash. Perhaps the gods had a plan. The world might have exploded from the fury elicited by way of untamed Marshall stack from this show alone.

Bill Graham's "Day On the Green" concerts were epic. Check out the full listing of events by year, here.