CoderDojo is a network of free, volunteer-led, community-based programming clubs for young people. Anyone aged seven to seventeen can visit a Dojo where they can learn to code, build a website, create an app or a game, and explore technology in an informal, creative, and social environment.
CoderDojo is not curriculum based, so every Dojo covers different topics. In most Dojos you will need to bring a laptop.
You can search for a CoderDojo running near you here.
Read more about CoderDojo here.