Teams Webinars Secret List /What's New in Microsoft Teams

John Moore’s excellent guide to using webinars – https://www.youtube.com/watch?v=QFZf2X-OzfQ

Webinars are now with us in Microsoft Teams, but where is the registration data stored?
I’ve found the secret lists, check out how you can then use Rules or Power Automate to be notified every time someone registers, remind attendees on the day, automate a follow-up email etc.