Multi User Issues

I have been working with WP for a few years now as a web developer, and I’m looking to hopefully use this plugin to accomplish all that I need, however I need some insight on how to do so if it is possible. I want to use wordpress to avoid any lengthy java programming for the site.

I need a calendar that will allow specific users to create appointments and then allow other users to only comment on the appointments made. The catch is, only users with specific permissions can see specific appointments. I am trying to use this plugin in combination with a user role management plugin to achieve what I need. Remember the catch is, that I need to have different levels of users and certain users will be able to see certain levels of events. For instance, a level 1 user can only see level 1 events as specified by the creator of the event. Whereas, a level 3 user can see level 1,2,3 events as specified by the creator of the events. Users permissions(level) will be completely managed by me(admin).

Thank You For Any Imput