Burning Man, black rock desert, USA.
Area : about 5 km2
Official attendance in 2016:: about 70000 people per day during 8 days.
1 people each 72 m2
Conclusion about my search of the event on Sentinel-playground: EASY! The event is iin the middle of the desert, high contrasts, long preparation time, no cloud, .
Festival des Vieilles Charrues, Carhaix, France..
Area: about 8 hectares for the music festival and 20 hectares for the camping area
Official attendance in 2016: about 70000 people / day during four days.
Density: 1 people each 4 m2
Conclusion about my search of the event on Sentinel-playground: LUCKY! I searched for other big european music festivals and found only this one. Most of the dates appeared to be cloudy or without image during the festival..This one was perfectly clear.
Conclusion: I still can't hear the music