A fan died while dancing in the crowd at Grateful Dead offshoot band Dead & Company’s concert at San Francisco’s Golden Gate Park over the weekend, reports say.

Trey Anastasio of Phish, Billy Strings and Sturgill Simpson were among the special guests to join the band over three nights of concert and amid a city-wide celebration.

The group, led by founding Grateful Dead members Bobby Weir and Mickey Hart, kicked off its three-night run of shows honoring the iconic band on Friday.