Well, ok, I'm not doing anything specific just yet (but you never know) but it seems like an important thing to acknowledge at the very least.
There are a bunch of events happening this week - tune into 2XXfm 98.3 if you are in Canberra for announcements or check out this website - http://www.internationalwomensday.com/
(There are 109 events in Australia alone listed - see what's happening in your area here)