Ugo Lattanzi gave a presentation on Node.js for .NET developers and vice versa. He began by explaining what Node.js is and its advantages like being fast, lightweight and suitable for real-time applications. He then demonstrated how to build a basic web application using Express.js and the template engine Vash, which is similar to Razor. He also discussed database options, validation, middleware, and Edge.js for connecting Node.js and .NET applications. Slides and demos from the presentation would be available on his website in the following days.