Hi Myriam,
Thanks for checking out our plugins!
There are a few ways that you could go about making a private event…I would recommend taking a look at the following articles:
Admin Roles and Permissions
Making a Members-Only Calendar
You can also set specific events to “Private”, just like other post types, and only logged-in users will be able to see them.
There is not an out-of-the-box way to send out “invitations” to events, but you can require users to be logged in to RSVP for tickets (with Event Tickets) or purchase tickets (with Event Tickets Plus).
We do offer full refunds within 30 days of purchase, so if you’d like to take Event Tickets Plus for a test run, feel free to do so! Please let me know if you have any additional questions.
Thanks,
Jennifer