Hi Walter,
Thank you for reaching out 🙂
You should be able to import events from not only your Facebook pages and groups, but any Facebook pages and groups! You can also import events from Google Calendars, iCal and .ics files, and Meetup.com! You do not need to be the owner of the events to import them. If you haven’t already reviewed the Event Aggregator product page, I encourage you to do so as it contains all the details. This is also another helpful article reviewing the features.
Please let me know if you have any more questions and have a good afternoon. Cheers!