On Sept 19-21, 2017, Microsoft held .NET Conf 2017. The site describes it as follows:
.NET Conf is a free, 3 day virtual developer event co-organized by the .NET community and Microsoft.
Over the course of the three days you have a wide selection of live sessions that feature speakers from the community and .NET product teams where you can learn, ask questions live, and get inspired for your next software project.
You will learn to build for web, mobile, desktop, games,…