The Containers 101 online meetup featured a detailed live demonstration on building a simple micro-service using Node.js and Docker, specifically focusing on essential Docker commands such as search, pull, run, commit, and push. The session emphasized that while the docker commit command is a useful method for creating Docker images from containers, it is just one of several approaches, with future meetups set to explore Docker Files and the docker build command. The demonstration was conducted using Docker 1.7 and Boot2Docker on Mac OS, and the recording, along with additional content, is available on the Codefresh Vimeo channel. Participants are encouraged to engage with the content by commenting or attending future sessions of the Containers 101 online meetup.