Create an event shirt the is unique and interesting.

1) Typically, 2/0 on white
2) Needs to be funky and desirable by developers...not just a "logo shirt".
3) Has event logo and dual branding
example:http://design.jboss.org/jbossorg/branding/JUDcon/2012/boston/shirts/images/judcon2012_boston_final.png