This tutorial investigates and demonstrates proven solutions for industrial scale collaborative modeling, maintaining a version history in standard tools as the models and modeling language evolve on the fly. It will show how to achieve smooth collaboration between multiple simultaneous modelers. The aim is low effort and low ceremony for modelers, while maintaining the use and benefits of version control systems familiar from coding. Alongside the models, the modeling language can also be evolved collaboratively in a similar way, with minimal work for metamodelers and minimal impact on modelers. The evolution of the models and metamodels will be recorded in the version history, with participants able to see their own changes and document them in version comments. Participants will gain practical experience and understanding by taking part in the modeling and metamodeling using the provided no-install desktop or browser-based tools — or their own tools, prepared ahead of time with the materials. Explanations, discussions and tasks will help all participants think through the hows and whys of the collaboration mechanisms.