Hi Dan,
Thank you for reaching out to us!
Did you check this thread?
In that topic my colegue Cliff explains exactly how the import process works:
“If an event from Google Calendar gets modified, it would modify the WordPress event (depending on your settings within the plugin) — like change from Saturday to Sunday. However, if it gets entirely deleted from Google Calendar, the Saturday event won’t be modified at all within WordPress.”
You can decide what happens to events in your site if they are re-imported by accessing your Dashboard and heading over to Events -> Settings -> Imports -> Event Update Authority.
In this case I would recommend you to choose the first option: Overwrite my event with any changes from the original.
We have a feature request to Delete events from WordPress when deleted from the source here.
I would recommend adding your vote there. This allows us to gauge interest in this particular feature request, which helps us prioritize our development efforts.
I hope this helps! Let me know if you have any other questions and I’ll be happy to assist!
Best Regards,
Patricia