Trash Hero Luzern in Switzerland has been working with the Sunset Beatz festival to reduce single-use plastic. They developed a deposit return system where festival goers pay a $2 deposit for a reusable cup. When they return the cup at the end of the night, they get their money back. The system has prevented the use of 95,000 single-use cups over five years. As well as reducing waste, Trash Hero volunteers collect and sort trash during the event.