Comment # 6 on bug 1053947 from Eli Wapniarski

grep Holidays ~/.config/korganizerrc
Exclude Holidays=false

produces
  Holidays=il_en-us

I tried deleting
  ~/.kde4/share/config/korganizerrc
some time ago and the file is not there currently

Progress though
After renaming 
  .config/korganizerrc
and restarting korganizer, I changed the holiday to:
  Israel (English)
Restarted Korgnaizer; no joy. Did the same for:
  Israel (Hebrew).
Again, no joy. However, when I changed to:
  Canada (English).
I finally saw holidays. But not, unfortuneately the holidays I need.

rpm -qa | grep oliday                                                           
  kholidays-17.04.2-1.1.x86_64
  libKF5Holidays5-17.04.2-1.1.x86_64
  kholidays-lang-17.04.2-1.1.noarch
so the package is installed.

I took a look inside the rpm and found that the files for Israel English and
Hebrew are included.

Just a side note... While the file for Canada (French) is included in the rpm.
There is no listing for it in the Holidays drop down.

So it would seem that there is a problem with the Israel holidays in the
library

I very much appreciate you helping me to resolve this.