Each King’s Day leaves behind over 250,000 kg of trash, much of it flowing from Amsterdam’s canals into the ocean. One day of celebration becomes a lasting blow to our environment.

The King’s Day Clean-Up After Party transforms Amsterdam’s post-party waste into a platform for innovation and learning. By engaging students in real-world problem solving alongside businesses, city services, and sustainability partners, the project turns cleanup into education, and celebration into civic action. It’s a collaborative solution that builds skills, fosters connection, and protects our environment—starting at the street level. This is true social innovation, action and strategic doing.