Müll für Millionen
The audience is being motivated to not throw trash in the area.

Solution

The trash is being counted after the festival: On the one hand there´s the trash from the containers, on the other hand there´s the trash found in the area. If there will be for example 30 tons of trash from the containers and 2 tons from the area we´d have 28 tons of trash being counted. This number will be changed into a benefit amount of money (for example released by sponsores). This way we can motivate people to throw their trash into the containers. The benefit money can be used for environmental issues or newcomers around the area, etc.