From the FIRST Web Site
FIRST® LEGO® League introduces young people, ages 9 to 14* (grades 4-8), to the fun and excitement of science and technology with over 25,000+ teams in approximately 80 countries, FLL is constantly expanding. If you are interested in helping create a formal FLL presence in your area by becoming a FIRST LEGO League Partner. Teams, composed of up to ten children with at least two (2) screened Lead Coaches, can also be associated with a pre-existing club or organization, homeschooled, or just be a group of friends who wish to do something awesome.
In FLL, the children do the work; like program an autonomous robot (using the LEGO® MINDSTORMS® robot set) to score points on a thematic playing surface, create innovative solutions to a problem, all while being guided by the FLL Core Values. These three elements - the Robot Game, Project, and FLL Core Values - make up what we call our yearly Challenge. Teams also fundraise, create a team identity, and talk to experts in the field.
Teams may attend an official FLL tournament, which is hosted by one of our FIRST LEGO League Partners. FIRST LEGO League Partners run the FLL program in their region or country The webpage states and are associated with other like-minded organizations to the FIRST LEGO League mission.