That is clear and very desappointing. I had that question before buying the pro version and i was answered that I could manage 2 separate calendars (one public and one private). Actually this is not the case : with the pro version, you can only display 2 calendars, but as long as the user clicks on the event detail, there is no more differences. In the examples you gave me, if I click on an event of the category “WP Meetup”, I can access to an event of the category “Learning” if it is the next event.
I regret to have bought the pro version then.