Truthfully, I only ever set up one Event up there for testing purposes, and only ever received one Event invite. I would think that Calendar provides a better service as Calendar actually sends a "meeting request" (like those in Outlook) which requires the respondant to RSVP. Additionally Calendar allows you to view at the same time all your other schedulings, making organising events/meetings/time all-in-one-place. I would think it makes sense to close Events and have Calendar instead. The only thing that would be missing is sharing documents and photos to organise the event, but hey, doesn't Groups provide that functionality already? Maybe, as JohnCz said, is Microsoft needs to integrate all these services to make them actually useful.

I just hope that the Windows Live Mail calendar bit gets updated, as currently I have no way to send meeting invites or invite other people to the meetings/events I create on Windows Live Mail.