Jimmy Wales (the founder of Wikipedia) and his wife Heather Ford from iCommons in Johannesburg have hatched a scheme to hold 50 parties in 50 cities around the world, with an Open Content/Creative Commons/Free Software sort of theme. You can read about it at iCommons or on Wikia, but what I'm most interested in is the Cape Town party, which is happening in a week and a half's time, on International Software Freedom Day.
Jimbo Wales will be here, and it should be good. It's at Deer Park Cafe in Vredehoek - head over to the wikia page and sign up!
Updated - I have no idea why I thought Heather was Jimbo's wife.