There’s something about watching small planes land on one runway of Gdynia’s Babie Doły Military Airport while you’re watching The Black Keys headline a festival from the other which lets you know that Open’er is not like other festivals. Located on a sprawling airfield in northern Poland, things don’t tend to get started until gone 6pm – which is pretty civilised for those of us who are staying in the nearby beach resort town of Sopot. The festival site serves hundreds of gallons of Heineken each year but frowns on spirits, giving it a reputation as the sort of place serious music fans come to watch music, not just get out of their heads. That could be part of the reason they attract some of the world’s biggest bands and most exciting new artists here to entertain 60,000 Pole dancers over four days.