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 Netherlands
50%
30%
10%
10%
10
flagthe United States
49%
33%
10%
6%
65
flagGreece
47%
26%
10%
15%
19
flagAustralia
41%
33%
0%
16%
12
flagCanada
40%
50%
0%
10%
10
flagGermany
35%
57%
2%
5%
40
flagIndia
35%
41%
23%
0%
17
flagPoland
29%
55%
8%
5%
1524
flagthe United Kingdom
17%
65%
5%
9%
52