Issue:

There is no direct way to sync OG calendars with Confluence calendars

Suggested Solution:

Create an integration for calendar sync between the two platforms

Workarounds:

Webcal protocol (webcall://) should be supported by Team Calendars. Currently, changing the webcal:// to http:// is the workaround for adding OG calendars to Confluence but there is no way to update confluence calendars and have that update OG.