DevFest is the world's largest community-driven tech conference, bringing together developers and builders to learn, build and connect. Each year, GDG organizers create a global momentum with 750+ events happening from October to December in almost every corner of the world. Each one with their own, local flavor but all under one big DevFest umbrella. Google Developer Experts (GDEs) and Googlers are an important part of this puzzle: giving talks, showing demos and leading the “learning by doing” sessions.