You got some great pics too. I started out right in front of the right stack but like others have mentioned it was so loud I ended up moving to the back of the crowd. I usually bring ear plugs...
I was guessing somewhere around 15,000 too. The lower level was still pretty full. Here's the pictures I took. https://picasaweb.google.com/nixnaegie/20110410?authkey=Gv1sRgCMK9hczU45...
Just stumbled upon this site from the Artist who did the free poster they gave out after the show.
http://hughillustration.com/2010/09/avett-brothers-poster/
I needs one!
I can has it?