If you want to have the OrgOS calendar in your personal calendar, please follow these steps:
Go to Calendar > Export > Click on the clipboard icon next to the URL. This copies an iCal link, which you can include in your own calendar.
If you are using Goolge calendar and need more information on how to import an external calendar, please check this link: Google calendar help.
To import it to Outlook, please see this link: Outlook calendar help.
To import it to Mac, please see this link: Subscribe to calendars on Mac