Hi Neal,
Great questions!
Can Gravity Forms be used for Community Events as the default event registration form?
It probably can – however you would need to take care of integrating the two plugins, that kind of custom integration with a third party plugin is not something we would be able to provide a lot of in-depth support for.
And if so can the event creator have access to export only their event attendees.
Just right now if you were to activate one of our ticketing plugins alongside Community Events, there would be no default means of letting event authors retrieve that information.
It’s certainly possible as a further customization, though – all of our plugins have been built with extensibility in mind 🙂
I hope that answers your questions and let me know if we can help with anything else.