GitHub provides public API for obtaining detailed information about various events performed by users across public repositories: git pushes, pull requests and reviews, github issues and comments, github stars, etc. The information about these events is available at https://gharchive.org in the form of per-hour compressed files with JSON lines representing all the events. The number of events recorded per year is ~1.5 billions. The total size of events per year is ~7 terabytes. This sounds like a big data. The talk shows how to explore this data at high speed and minimal costs and how to obtain interesting insights from this data.