Full disclosure: this is my river, my ten-minute HEV ride from Batthyany ter. Sziget still throws five days and hundreds of acts across Obuda Island every August, and yes, it long ago stopped being a scrappy local secret. Twenty One Pilots headline this year. What holds up is the layout: stages threaded through the trees, the Danube on both sides, a proper mess of a crowd by night three. Day tickets run 109 euros, five-day passes 399. Bring earplugs and a tent.