Fes­ti­vals are going through big changes and the new­er breed of events are more often tak­ing place in the very cities we’re usu­al­ly so keen to escape from.The for­mu­la we’ve tra­di­tion­al­ly enjoyed, three days or so camped out in the fields of an oblig­ing farmer with enough bands and DJs to keep you hap­py, has shift­ed to encom­pass a new…