RailsConf
RailsConf, co-produced by Ruby Central, Inc. and O'Reilly Media, Inc., is the largest official conference dedicated to everything Rails. Through keynotes, sessions, tutorials, panels, and events, RailsConf is an interactive meeting ground for the most innovative and successful Rails experts and companies. The conference provides attendees with examples of business models, development paradigms, and design strategies to enable mainstream businesses and new arrivals to the Web and Rails to take advantage of this new generation of services and opportunities.

RubyConf
Every year since 2001, Ruby Central, Inc. has produced RubyConf, the International Ruby conference. Attendance grew by a factor of ten between 2001 and 2006. RubyConf has provided a forum for presentations about Ruby technologies by their creators, including talks by Nathaniel Talbot on Test Unit, Jim Weirich on Rake, David Heinemeier Hansson on Ruby on Rails, Why the Lucky Stiff on the YAML library, and Sasada Koichi on YARV. Matz has attended, and spoken at, all the RubyConfs but one.
RubyKaigi