We ran the planetarium show on a day when mobile internet was being jammed. For us it was a test run: the show page opened because our domain is set up to work even with the network jammed. And the flashlights sync by ultrasound, no mobile connection needed.
Viewers scanned the QR code and became part of a shared light picture under the dome.
This matters for stadiums, festivals and anywhere the network is overloaded or restricted. How the sync works is explained in our ultrasound article.
A show like this can close an indoor celebration where fireworks are impossible: options in what to use instead of fireworks. All celebration formats are on the corporate events and weddings page.
