Then after almost a week like that, the message text has now changed to say that they are no longer accepting new registrations for this event. I don't know what more I could have done but it seems to come down to luck. No idea what comes next or whether it means I fall out of the process, even though I passed.
It could be that the online "event" has expired but that they will create a new one in the future with more dates. I have no idea, but I doubt the whole process comes down to the luck of when you opened the email