U2âÄôs June 27 concert at TCF Bank Stadium has been postponed until 2011 so lead singer Bono can recover from back surgery undergone Friday. The groupâÄôs entire 2010 North American 360° tour, which was scheduled to begin June 3 in Salt Lake City, was canceled. âÄúOur biggest and, I believe, best tour has been interrupted, and weâÄôre all devastated âĦ [BonoâÄôs] concerns about more than a million ticket buyers whose plans have been turned upside down, we all share,âÄù U2 band manager Paul McGuinness said in a statement. A Ticketmaster e-mail sent to the concertâÄôs ticket holders assured them that their purchases would still be good for the new date, which is yet to be determined. âÄúWeâÄôre one of 16 venues in North America that are being rescheduled for next year,âÄù University of Minnesota spokesman Dan Wolter said. âÄúObviously that is a huge logistical challenge.âÄù Wolter said the University is in discussions with Live Nation, the concert promoter, to reschedule. Wolter stressed patience and said a new date for 2011 could be set within a few weeks, though he was unsure of a timeline for setting the new date. âÄúWe obviously donâÄôt have events of this magnitude very often in TCF,âÄù Wolter said, âÄúso we may have a little more flexibility.âÄù The more than 50,000 tickets available sold out in about two hours in November. Ten thousand of those tickets were reserved for University students and Gophers season ticket holders. Live Nation and Ticketmaster have yet to determine the process for those who end up refunding their tickets.