NodeSchool is a fantastic resource for learning about Node.js and the related ecosystem around Node. There are a series of curricula which are designed with a choose your own adventure style. They are meant to help you learn core concepts of Node.js but it also provides a framework for creating your own curriculum.
NodeSchool is fantastic not just because it helps members of the community to learn about Node and its ecosystem, but because they provide a framework that can be replicated in your own community to train your members. They provide these resources free of charge and open source to make it easy for anyone to run their own NodeSchool event.