In May 2018 the International School of Amsterdam came to Makerversity for a design challenge day, and member Duncan Gidney and I set them the task of designing and building kites, using only basic materials, and without detailed instructions.
We chose this activity partly because of the size of the group - 100 kids - was more than we could fit in any of our indoor spaces, and we were lucky that the weather cooperated and it was sunny (with a little wind) on the day.