Grateful Dead founder Bob Weir is canceling all of the tour dates he had planned through January, including an Aug. 31 concert at Ravinia Festival in Highland Park with Dwight Yoakam.
The guitarist says his tour with the band RatDog won't kick off this week as planned. He posted a message Sunday on RatDog's website saying "circumstances have necessitated that all scheduled tour dates for Bob Weir & RatDog are being cancelled."
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The 66-year-old didn't offer more details. An agent for Weir didn't respond to an email seeking comment.
According to Ravinia's website, ticket holders for the Aug. 31 concert need take no action -- refunds will be automatically made to the original method of payment, and customers will be notified by e-mail.
Weir also is canceling a September performance at the Lockn' Festival with Furthur, the band he formed with fellow Grateful Dead member Phil Lesh.
Weir fell onstage at a concert last year. Lesh told the crowd that Weir had been suffering from a strained shoulder.