Hey Anastasia,
Thanks for reaching out and for your interest in our plugins!
1. Would we be able to charge for an event submission? If it’s not possible out of the box do you know of workarounds/solutions that we could consider?
There is no way for our plugins to do this on their own, unfortunately—but you can implement paid access to the submission form with something like Restrict Content Pro.
2. Can I integrate imports from multiple macbook events pages (e.g. from other people who want us to display their events so that they would be able to provide us any information we might need for multi-FB integration)
You wrote “multiple macbook events pages”—do you mean multiple Facebook pages? If so, then yes, you can import from several Facebook pages. If you mean something else let me know, and sorry in advance for my misunderstanding. 🙂
3. Is there any way to have advertising pop ups, banners, etc. integrated into events’ pages?
This is possible with some code customization—we are not able to help with that at all, unfortunately, so if you cannot make the code edits on your own you would likely need to hire a professional developer to help.
You can learn the basic methods for making the sorts of customizations required by reading this page → https://theeventscalendar.com/knowledgebase/themers-guide/
I hope this helps!
George