Hi Luka,
I'm glad you got the conditional format working.
It was a little struggle, but sometimes you get fully paid 
About your code....Not quite what I was looking for.
I tried It, but in this sample It doesn't work If I call It from Clear_Cells macro. It's should be placed there, just before all cells are being cleared.
However, It works separately, but when code is executed It adds blank ListFillRange to shape. If you try to click on shape after that, you'll notice shapes don't have their drop-down list anymore, which is not what I want. Just want to give them blank value & leave drop-down lists. I think that could be done with ListIndex, first index of shapes is blank.
This is how I tried your code :
Maybe code for shapes is also interfering (DropDown_Change macro) ?
Also, check 1st day in December - It's deleting everything there, not sure why.
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