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
54%
31%
9%
5%
74
flagGermany
50%
43%
3%
3%
58
flagthe Netherlands
50%
30%
10%
10%
10
flagGreece
45%
30%
10%
15%
20
flagAustralia
41%
33%
0%
16%
12
flagCanada
40%
50%
0%
10%
10
flagIndia
38%
38%
22%
0%
18
flagPoland
30%
55%
8%
5%
1576
flagthe United Kingdom
17%
65%
5%
9%
52