Like Altamont?
Altamont was another screwup from Michael Lang. How he still gets name checked in these gigs is a mystery to me

No horror show.
40,000 attended
http://historicpalmbeach.blog.palmbeachpost.com/2009/11/26/november-1969-palm-beach-countys-own-woodstock/
The tally: 130 drug overdoses, 14 eye injuries, 42 intestinal disorders, 1,700 headaches and minor cuts, 1,000 reported conversions to Christianity, 130 drug arrests, and one death, of a teen struck by a truck. Rupp lost $300,000 to $500,000, all the cash I had and all that Id borrowed.
In 1999, Heidtman who would die at 91 in 2007 dismissed as myths reports he planted alligators in canals and red ants in the fields, saying Florida always supplies plenty. But he did unapologetically say, If I had it to do over again, Id try to stop it.
Toronto had Little Richard, Jerry Lee Lewis, Chuck Berry, Bo Diddley, Gene Vincent, Alice Cooper, the Doors, Tony Joe White, Chicago, and John Lennon with Eric Clapton.
https://en.wikipedia.org/wiki/Toronto_Rock_and_Roll_Revival
Barely a month after Woodstock. These weren’t spontaneous knockoffs
Detroit
Dr John
MC5
Chuck Berry
Sun Ra
Iggy Pop and the Stooges
Ted Nugent and the Amboy Dukes
Brownsville Station
Johnny Winter
The James Gang
The Bonzo Dog Band
Grand Funk Railroad
https://www.festivival.com/history/first-annual-detroit-rock-and-roll-revival-1969