In order to make one of your calendars available to the public, you can define calendars to be uploaded to a web server under EditPreferencesCalendar and TasksPublishing InformationLocationsAdd.

You can specify the online location, the frequency of publishing, which calendar(s) to publish, and authentication information for uploading.

You can publish Calendar and Free/Busy information to a WebDAV server, FTP server, a remote machine through SSH or to any other web server with HTTP PUT support.

To immediately publish calendar information, click ActionsPublish Calendar Information in the calendar.