Every second year there is a large developer/hacker summer conference in Europe. This year it is SHAI (sha2017.org) from August 4th to August 8th in the Netherlands.
Different developer groups, social initiatives etc. do presentations and run demo/hacking in their own tent, called “Village”. Of course, there is a Z-Wave village where people can come in, develop their own stuff (using Z-Uno; z-uno.z-wave.me) or just have fun with Z-Wave.
Every of the several thousand visitors gets an electronic badge that is connected to WIFI and offers a small display and button. The Z-Wave team managed to get a special application on every badge to allow visitors to turn on/off the LED lighting of the Z-WAVE banner outside the tent.