Gregg Allman, a founding member of the band, has been treated for hepatitis C

The Allman Brothers Band announced on Thursday the postponement of its annual 15-show engagement at the Beacon Theater in Manhattan, scheduled for May 5 to 24. New dates are to be announced, and tickets will be honored at the rescheduled concerts. The band canceled its performances as host of the annual Wanee Festival in Live Oak, Fla., although the festival will continue as scheduled on April 11 and 12. For six months Gregg Allman, a founding member of the band, has been treated for hepatitis C, and the announcement said the treatment has so far been successful.