I’ve always had a soft spot for Field Day fes­ti­val: its cura­tors have form in entic­ing less­er-seen artists onto their fes­ti­val stages, such as Mazzy Star’s mem­o­rable set in 2012. Field Day’s move this year from Vic­to­ria Park to the con­sid­er­ably small­er Brock­well Park has not been with­out its issues – from pre-event con­cerns from…