Check it out! The Nexuiz community is welcome to set up booths or just peruse those already up. You can check out previous year's expos at http://www.quakeexpo.com.
What is it? From the FAQ:
QExpo is akin to E3 - only it features the modders and enthusiasts of a persistent, flexible, and strong series of games. For a few weeks 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.
Birthed out of the Inside3d forums and catalyzed by CocoT, the first QExpo was setup in 2001 by Horn, Nane and JBallou, graciously assisted by FrikaC, LTH, Akuma, and Koolio. It returned once more in 2003 by many of the same people, including FrikaC, Quest, and SantaClaws. For 2005 it was hosted by MauveBib, Wazat, SantaClaws and Echon, and featured for the first time the inclusion of Quake II.
As a long-term, overarching goal, Quake Expo could be seen as a bi-yearly check-in for the community, showcasing what people have been up to, what they'd like to be doing, and who they could possibly be doing it with. As modern games get more and more complex from a modding standpoint, games like Doom and Quake still allow a whole lot of flexibility and a gentle learning curve for people who want to get into game design or programming. Besides that, there's a decade-plus of previous experience to learn from, not to mention play through and enjoy - because let's face it, Quake Rocks!
Be sure to check out my Basement Remake page to learn a thing or two about clean brushwork

http://qexpo.tastyspleen.net/booth.php?id=11&page=296