Joomla Day is the premier gathering of these individuals, including web designers, site managers and other Joomla users—from novice to experienced—for a day-long conference. Joomla! is a free and open-source content management system (CMS) for publishing web content. It is one of the most popular website softwares, thanks to its global community of developers and volunteers, who make sure the platform is user friendly, extendable, multilingual, accessible, responsive, search engine optimized and so much more.
see: JoomlaDayChicago.com for details