'Manage Calendar Events' Best Practice?

Summary

Is there a way to upload calendar events annually and globally?

Content

In HCM, Setup and Maintenance>Manage Calendar Events.

Is there a best practice to set up holidays/calendar events annually and globally in HCM? Is there a way to upload calendar events to HCM? We are currently manually adding each calendar event for each country every year, since some holidays change. We are looking for a better way to utilize the system to keep these updated, but are not aware of one. Any information would be helpful!