SLAM Rally.

Well, that was fun.
It's hard to convey just what it feels like to march down the middle of the main streets of your home town on a sunny afternoon, with 10,000 or so friends, all for a good cause. This video will give you some idea of the kinda casual, relaxed and goddam noisy nature of the thing:

This article is a great overview, even if the crowd estimate is perhaps somewhat generous.
I was very proud to be there, and to be part of the group of people I was with, even if some of the speeches at the end got a little...serious:

The organisers, the bands, and everyone who came should pat themselves on the back today, and then prepare for round two.

Thanks to Colette for that photo.