Create public and private events also

Hello,
I downloaded and installed with your plugin, but I have a problem to enable a user regardless of the role they have in site (director / subscriber / event creator), to can post both public and personal events. How can I get each user to be able to publish personal events that wants to share only with specific users or friends without the site administrator’s consent and without these events appear on the site, visible to everyone.
Also I want to be possible for each user when he create an event, to can make different each event (with a different color / icon / tag) in the list of events, depending on the type of event, public, private (visible only a certain group of users), or personal.
How can I create user groups where already registered users can join? How can users create their own groups? Do you know any plugin that you can integrate with your plugin to solve these two problems?

https://www.ads-software.com/extend/plugins/all-in-one-event-calendar/