Hi Mona,
Thanks for checking out our plugins!
With The Events Calendar, users will need to be able to login and create new posts on the back end in order to be able to create events…otherwise, there is not any user management within the plugin.
With Community Events, you can choose to require users to login to submit events from the front end.
Either way, all user-management is handled within WordPress – both The Events Calendar and Community Events use the standard WordPress users on your site.
We do offer full refunds within 30 days of purchase, so if you’d like to take Community Events for a test run, feel free to do so! Please let me know if you have any additional questions.
Thanks,
Jennifer