Hi there,
Thanks for reaching out. I will try to help with your questions.
Our plugins currently have limited functionality when it comes to email notifications. The only emails our plugins send out are the actual tickets to the attendees. (The community events plugin can also send notifications when events are created.)
As far as importing users: it would be possible to import a group of Organizers, but beyond that, the only other option would be to import general WordPress users. We do not have any way of grouping WordPress users.
Hope that helps!
Thanks,
Sky