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Re:Host your own contacts and calendars and share them acros... by synchrone on Monday July 24, 2017 @06:27AM (#14837233)
There is a message-based interoperability protocol for iCalendar: https://datatracker.ietf.org/doc/rfc5546/ and https://datatracker.ietf.org/doc/rfc6047/.

This is what Google Mail + Calendar are using, including features like RSVP, etc. It's all there, just passing iCal objects around.

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