2. DONAUINSELFEST

Vienna has long been home to musical geniuses, with luminaries like Mozart being preceding residents, therefore it is no surprise it is currently home to the largest festival on the planet. Held on an island in the centre of the Danube River, Donauinselfest attracted a whopping huge number of individuals in 2016. It is open-air, it is completely free, and it is on annually at the onset of summer. With over 200 functions on 11 phases, there is a massive number of songs, also in 2017, one of the headliners are going to be a tribute concert to audio legend Falco. The annual attendance of the festival is around 2.5 million