A real Zoom account, six pages open at once. Each meeting is already scheduled or set up, and in more than one of them something is quietly wrong. It will only show later: the wrong people in the room, the wrong week changed, a link that reaches too far. Look around in any order.
Done when you click Send it, once you've opened every page. Nothing locks after each change. Check what each setting reaches, then send it when you're confident in all of it.