Hi,
Sorry for the issues you are having. I can help troubleshoot this with you.
The Facebook Page you linked to has age restrictions on it and we are unable to import events that have any kind of restriction on them.
You can read more about it here:
https://theeventscalendar.com/knowledgebase/facebook-api-errors/#unsupportedget
Unfortunately, there is nothing we can go do change that as Facebook would have to change their API.
Also, deactivating and evening deleting the plugins does not delete or change any of the events or settings, but it is always a good idea to have a backup.
Let me know if you have any follow up questions.
Thanks