Groundwork has been done, so it is definitely planned: https://github.com/diaspora/diaspora_federation/pull/44
Hopefully, this gets a bit more attention now that the big cleanup work of the codebase has been done.
> Does event management exist yet? I.e, can my friends and I create events and invite people to them like you can on Facebook?
No, not yet. See https://github.com/diaspora/diaspora/issues/1359
Lack of integration with their calendar right from the off is why Google Plus flopped, I reckon.
Also, ISTR from last time I played with it, there was no ability to create photo albums/collections. Does that exist now?
Without those two things I couldn't even begin to consider getting people to start using it.