[SOLVED] No regions for KDE4 calendar

Hi,
I would like to see holidays in my KDE4 plasma calendar. However, when I get into configuration, there's no holidays region at all.

What should I install to make them appear? Thanks in advance for help.
I would like to see holidays in my KDE4 plasma calendar. However, when I get into configuration, there's no holidays region at all.

What should I install to make them appear? Thanks in advance for help.