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YellowHow to add regional public holidays to your Google Calender (desktop)Draft | Seeing Public Holidays in your Calendar
If you want to add public holidays of your for example Croatian colleagues or your American customer to your Google Calendercalendar (which is powered by Google Calendar), you need to add them in your settings.
go Go to the calendar settings (click on the gear wheel on the top right)
open Open the "add calendar"-field on the right side
"browse Browse calendars of interest"
open Open "regional holidays"
put Put a check  in the field of the holidays you are interested in
done 😃 Done
Follow this link if you want to know how to do it for the iOS and Android Google calender app.