Bug with the holidays calendar

Sometimes if you change language or a calendar type on an iPhone®, the holidays calendar disappears.

(Version française de ce tutoriel)

To make it appear again, I have done this:

1. Go to:

Settings -> E-mail, contacts, calendar-> iCloud account ***@icloud.com

and make the Calendar synchronisation active;

2. Open Calendar, switch the holidays calendar off, then on;

3. Switch off iCloud calendar synchronisation.

Then I saw the holidays calendar appear again.

Hopefully that helped you. Tell me in the comments!