Stichting Kennisplein organizes extracurricular activities for children. Along with a few others, I was a coordinator and supervisor of extracurricular club activities for children about scientific research and robotics.
For the robotics part we used LEGO Mindstorms and met up weekly, hosted multiple events and participated in multiple official contests hosted by LEGO.
There is an old video that I decided to put here to show you a rough overview of what one of these contests looked like.
Be warned though: The video was edited by kids!