i think cickentraders calendar although not structured the way most people would read a calendar, already has a ton of events on it he has done some of the hard yards ... if there is going to be 'the' australian rc events calendar it should be widely accepted and as complete as possible
although in saying that it could also be beneficial to have a state by state calendar ... thats one of the reasons it might be worth looking a user developed php calendar (or the like) where you can combine different calendars - google calendars look pretty 'flat' to me??
TJ maybe you could liaise with chickentrader and make the thing work together?