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

Austria
USA
Spain
Russia
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
flagthe United States
53%
28%
12%
5%
39
flagGreece
50%
25%
12%
12%
16
flagGermany
36%
54%
0%
9%
22
flagPoland
28%
55%
9%
5%
848
flagthe United Kingdom
12%
66%
12%
4%
24