Hi Mary,
With Community Events, users are only able to edit the events that they have created themselves. To be able to edit events that come in through Event Aggregator, they would need to have accounts that let them access the back end of your site.
If this is a feature you would like to see added in the future, please do let us know over in our Feature Ideas Forum. This is what we use to gauge user interest in new features and help guide future development efforts.
I’m sorry I don’t have a better answer for you here, but please let me know if you have any questions!
Thanks,
Jennifer