Hi,
Thanks for the interest in our plugins.
With the Eventbrite plugin you can import any Eventbrite Event you like so you can add more events to your calendar in seconds instead of coping and pasting.
Also, as you mentioned you can register events created in the Events Calendar in Eventbrite from WordPress. Once an event is registered it is connected to that Event in WordPress and it has all the links to take you to Eventbrite to make changes and you can monitor the status of tickets sold from the event in WordPress. As this screenshot shows:
https://theeventscalendar.com/content/uploads/2013/02/Eventbrite-event-backend-e1419976507170.png
Let me know if you have any follow up questions.
Thanks