Where is the biggest open-air music festival in the world organized?

Austria
USA
Spain
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The Donauinselfest (German for Danube Island Festival) is a free open-air music festival taking place annually at Donauinsel in Vienna, Austria. With over 3 million visitors in 3 days, it's the biggest open-air music festival in the world.
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Very interesting!
reach: rather globalcountriesfestivalsmusicrecords

Answers by country

Austria
USA
Spain
Russia
answers
flagGreece
57%
14%
14%
14%
14
flagthe United States
55%
27%
11%
5%
36
flagPoland
27%
55%
10%
6%
687
flagGermany
26%
66%
0%
6%
15
flagthe United Kingdom
11%
70%
17%
0%
17