Hey Marcus,
Thank you for reaching out to us!
You can decide what happens to events on your site if they are reimported and the event at the original source has changed by accessing your Dashboard and heading over to Events -> Settings -> Imports -> Event Update Authority.
We have an article about EA import settings: it is a little bit outdated but might be helpful to better understand some of the available options:
Event Aggregator Import Settings
I hope this helps! Let me know if you need anything else and have a great weekend!
Regards,
Patricia