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Re:A “gold standard” study finds deleting Facebook is great ... by amelius on Thursday January 31, 2019 @11:47AM (#19046135)
Do they support "events" yet?
Re:A “gold standard” study finds deleting Facebook is great ... by prophesi on Thursday January 31, 2019 @12:21PM (#19046515)
You could give Hubzilla a shot. Though you have to opt-in to join the ActivityPub federation. And I'm sure the Events only works with users from other Hubzilla instances.

https://project.hubzilla.org/page/hubzilla/hubzilla-project