I'm still thinking about it, but we may way want to be careful about posting things within the calendar events themselves.
I think we decided a while back, maybe to draw people to the forum that find the calendar entries through Google, that the posts associated with each calendar event would be visible to the public. The calendar tab isn't public, but the posts in the calendar board are.
While I think it's generally of little concern if the general public knows if you're going to a show or not (given that Facebook already offers this functionality on their events), there have been some stalker-type situations in the past.
See internal thread for a previous discussion regarding this:
http://www.celticwomanforum.net/index.php?topic=1374.msg4761#msg4761It would get messy if we have separate threads to keep track of who's going to what though.
So one option would be to make the calendar posts only visible to members again, although I can't remember all the reasons we made it public.
Or if people are comfortable posting in an event that's visible to non-members, that's their choice and we can leave the calendar public like it currently is.