Fans don't need to rescan the QR code as long as they keep the web page open in their browser. If they simply lock their phone screen, the page remains loaded and they'll be ready when the Light Show starts. However, if they close the browser entirely or are browsing in incognito mode and refresh the page, they'll need to accept the permissions again. The key message to communicate to fans is to keep the Light Show page open on their phone until the activation begins.
