John Mayer Needs An Emergency Appendectomy

John Mayor Needs An Emergency Appendectomy Billboard first reported that John Mayor has had an emergency. Dead and Company Mayer's bandmates, Grateful Dead founding members Bill Kreutzmann and Bob Weir, promised concertgoers that the Dec. 5 show will be rescheduled. Dead and Company previously performed three shows at Madison Square Garden, but it's unclear if Mayer will be available to close the tour.