With over 500 camp attendees and 60+ session proposals, us organizers of Drupal Camp LA needed a Drupal site that was built for organizers and attendees, with lessons learned from 3+ DrupalCons & 2+ DrupalCamps. Here is our formula for our awesome camp site.
"DrupalCampLA.com was built on Drupal 6 using core & contributed modules to handle event registration, sponsorship management, featured speakers, user bio's, and session proposals. The website features an attendee driven event schedule where members propose sessions and only registered members pick which sessions they'd like to see (in the BarCamp style). Planning the schedule for the day of events has been made flexible enough to allow organizers to maintain a master schedule with ease. Not to mention that all attendees get their own schedule view with the sessions they pick."
"The web site was based on the latest Drupal 6.x release and utilized many of the current generation modules such as CCK for content customization, imagefield and imagecache to handle imaging Views & custom theming built on Zen for content presentation." (A full list of the modules used is in the case study - http://drupal.org/node/519100 )
The download link is available in the case study post - http://drupal.org/node/519100 and has been made available by LA Drupal & This By Them.

"Session Proposals nodes were created by CCK to provide the following additional fields: Day (text select), Time (text select), Track/Room (text select). In addition we created a new taxonomy vocabulary called "Categories" so that sessions could be organized into the following: Business Side, Code & Development, Design & Usability, Drupalchix, Performance & Scalability, Showcase & Strategy, Site Building. Using taxonomy to categorize the sessions was very helpful because of the benefits of Views module integration. Using the categories we allow visitors to filter out sessions based on their interests."
The camp site code is available for download. It is everything you will need to get your own camp/conference site setup is included in a friendly package (download link available in the case study post - http://drupal.org/node/519100 ). Included is a readme file that explains how to setup the site. It's basically the same as setting up a normal Drupal site except you'll want to import the database file we've included so that all of our views/content types/settings are ready to go! We recommend using the camp theme as your base and adding styles as you see fit.
* The site code and data are provided as is, with no warranty and no guarantee of support. The code is released under the GPL license (same as Drupal core).
Southern California