How to configure the Calendar that Clock pops-up?

Hi All, In KOrganizer you can select the Holiday Region (in Time & Date), so that Sat, Sun and all [US for me] holidays are shown in red. The panel app Clock will pop-up a Calendar when you click it, but it doesn’t seem tied to KOrganizer? Every day on it is black. Is there a way to get whatever runs the pop-up Calendar to do the same as KOrganizer with day colors? Or better yet, have Clock pop-up a mini KOrganizer calendar (so all the days are color coded and you only have to maintain one configuration)? Thanks, Michael