Hey @surferjohn,
Oh no! We do not see that come up very often but, when it does, it’s certainly troubling. Let’s dig into this together and get things back on track.
You had mentioned being unable to do anything via the admin, but I’m really hoping there’s a chance you can install this extension to your site, perhaps even manually by uploading it directly to the plugins directory on your server:
https://theeventscalendar.com/extensions/recurring-event-cleanup-tool/
That extension, when activated, will allow you to view a list of your recurring events and delete all of the recurring instances for a specific one. Please give that a try and let’s hope that does the trick right off the bat.
Thanks,
Geoff