I assumed the Darinbob was talking more about calendar invites - like in Google Calendar.
I imagine Google sees Calendar as already covering the "events" thing; I mean it's not difficult to set up a calendar that you and all your friends have admin access to, or just use Calendar to set up an event in your own calendar and email out invites to whoever you want if it's meant to be private. It lets you let invitees invite others too if you want.
Nicer G+ integration with it would be good (but I guess the top bar will take you to the Calendar if you need it). Maybe an option to post event invites to your circles (and thereby make them "public")?