Version: (using Devel) OS: Linux Installed from: Compiled sources korganizer uses italian holidays even if country is set to spain. System Settings - Regional & Language -> Country or region: Spain
korganizer doesn't look at regional settings for the holidays. afaik, the user needs to go into korganizer settings->Time&Date page and set the holiday region there.
Auto-default of holiday region is a good idea in say the plasma calendar (where it has been implemented for SC 4.5) but is probably not so good in KOrganizer where users may not want holidays displayed, or may want a different region displayed than their locale. And changing a users chosen region setting is not good if they really want the old region. One way would be to add "Use Locale" as an option on the region list which would then follow any locale changes. I'll ponder that for 4.6.
This bug has only been reported for versions before 4.14, which have been unsupported for at least two years now. Can anyone tell if this bug still present? If noone confirms this bug for a Framework-based version of korganizer (version 5.0 or later, as part of KDE Applications 15.08 or later), it gets closed in about three months.
Just as announced in my last comment, I close this bug. If you encounter it again in a recent version (at least 5.0 aka 15.08), please open a new one unless it already exists. Thank you for all your input.