Hamish pointed me at this a few days ago, and I've finally found a chance to sit down and pass it on...
I think it's best that we leave it as an informal thing. Just a pointer that the event is on, and that there could well be some great photos to be had.
The birdman people have all the details on their website: http://www.birdman.org.nz/ but the short version is that the fun and games are happening from 10AM to 5PM from the Taranaki Street wharf, with the main event at 1PM.
This is on Wellington Anniversay Day, so if you are in the capital, it should be good fun.
Some other options also exist around those days, including some stuff in Days Bay. More info on the birdman site.
Show up. Take pics. Post them here.