The two incidents may be unrelated, but five days after Bob Weir collapsed onstage during his band Furthur's set in Port Chester, N.Y., the group has canceled its headlining set at the BottleRock Napa Valley Festival in Napa, Calif. They were set to perform on May 9.

The next scheduled Furthur show isn't until July 11, but Weir has solo concerts scheduled for June 26-30. A statement on the TRI Studios Facebook page indicates that he will be good to go for those dates, but that "Grateful Dead & Furthur co-founder Bob Weir is unable to perform in any capacity for the next several weeks." TRI is Weir's studio that broadcasts online video and audio.

The nature of what's keeping Weir from returning to the stage wasn't revealed in the Facebook post or in a statement at the band's website. Weir and Furthur have played one show since the April 25 incident. Rolling Stone reports that he sang and performed "with force, as if to demonstrate his health and vitality" in Atlantic City, N.J. on April 27.

After Weir collapsed, his band helped him to a chair, and they finished the song. They all exited afterward and then returned without Weir; Phil Lesh said a strained shoulder was keeping his bandmate from returning. It's the second time in two months that a Weir performance has ended prematurely. On March 4, he stormed offstage after growing irritated with a chatty audience.