"QExpo is akin to E3 - only it features the modders and enthusiasts of a persistent, flexible, and strong series of games. For 11 days QExpo offers a chance to all diehard fans of these three Quakes to express their dedication in a myriad of forms.
More specifically, QExpo is a virtual convention. In the days prior to and during the event, people may register to create their own virtual booth, customized to showcase their Quake related content. People often get very colorful with these booths, featuring "booth babes", comics, short works of fiction, long works of fiction, screenshots, and of course mods, maps and engines. "
http://quakeexpo.com/
Nexuiz of course has a booth there, too.