After Surgery, Mumford & Sons Bassist to Return to Performing on Sunday The bassist Ted Dwane of Mumford & Sons has recovered from surgery to remove a blood clot in his brain and is well enough that the band will be able to appear this weekend at a festival in Glastonbury in Britain, the BBC and Reuters reported. The British folk-rock group, which won the Grammy for album of the year in February, was forced to cancel several concerts in the United States, including the Bonnaroo festival in Tennessee, after doctors discovered the clot and rushed Mr. Dwane, 28, into surgery. He was released from the hospital on June 14 and has been resting at home. The band said that Mr. Dwane would be onstage when they play their headline show at the sold-out Glastonbury festival on Sunday, one of the largest music events in Europe. "To be honest, Ted dealt with the whole thing better than any of us could have imagined," the keyboard player Ben Lovett said in an interview with The Radio Times published on Tuesday. All we feel is incredibly grateful and happy that he's going to be O.K. and that we're going to get back out on that stage at Glastonbury as four brothers and do what we do. The folk-rock band will close the festival's main stage on Sunday, sharing headliner status with the Rolling Stones and Arctic Monkeys. Organizers expect 175,000 people to attend. The band, formed in 2007, also plans to go back on tour in late August and has make up its postponed North American dates in September. Mumford & Sons, which also includes Marcus Mumford and Winston Marshall, won the top Grammy award for its album "Babel."