I used to have two native calendars in JEvent, one for events and one for bookings (and two for imports). I decided to change to have only one native since it didn't add any value, the categories are doing the job.

When I unpublished one of the calendars, all the events added in that calendar was gone from the frontend. In the backend they didn't differ from any other event so it took me a long time to discover that the unpublished "calendar" was causing the problem.
I am not a Silver member and do not have the Calendar Specific Menus and Modules addon.

How can I overcome the problem if I want to move from two to one calendar?