As you can probably tell by now Munki has upgraded the forums to the latest release and I, for one, could not be more delighted. For so long we've had to add calendar events and then turn around and create post for you guys to RSVP. No more do we have to do double the work to bring you events because now you can RSVP directly on the calendar event.
Now when you click on a calendar event you should see the new RSVP button on the right:
Once you click on the "I'm Attending" your name will be added to the RSVP:
If you change your mind and can't attend then simply click on the Red Circle next to your name.
Other good news: You can comment directly on the calendar event.