[groanup]

AJC reports 20,000 (per event organizers). I would have said less than 10,000 but I can't estimate crowds. I did have a view from the top of the Westin Hotel.

http://www.accessatlanta.com/ajc/metro/0303/16rally.html

[NicoleGTalum]

It was hard to tell. We looked at a map of the park and compared it to a full stadium at a Tech game - it could very well be 25,000.