US authorities are blocking a reunion of the surviving members of The Grateful Dead.
Promoters want to bring the group together for the first time since Jerry Garcia's death in 1995.
But Walworth County's highway committee is refusing to licence the event, fearing the county's 80 sheriff's deputies would not be able to handle the crowds.
The event, planned for August 3 and 4 in East Troy, Wisconsin, was expected to draw 200,000 of the band's fans, known as Deadheads.
The two-day concert dubbed Terrapin Station - A Grateful Dead Family Reunion, would reunite Mickey Hart, Bill Kreutzmann, Phil Lesh and Bob Weir on stage for the first time since Garcia - founder and leader of the Dead - died of a heart attack.
Dennis McNally, a publicist for Grateful Dead Productions, and Big Hassle Media, the festival's publicist, has not commented on the decision to refuse a licence.