Finding my old calendar / to-do

I took a plunge and totally upgrade my system. In doing so I first 
renamed .kde and .local folders to later be able to copy/import vital data.

So far I have imported email, I did lose a few but nothing important. 
Also Notes have been imported.

But I am at a loss with KOrganiser Calendar/To-Do, I try to search my 
"old folders" but whatever folder I try to import or copy I end up with 
empty Calendar/To-Do.

Anyone have an idea where these might be hiding?

Kind regards,
Sinclair
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