Google Developer Groups (GDGs) are for developers who are interested in Google's developer technology; everything from the Android, Chrome, Drive, and Google Cloud platforms, to product APIs like the Cast API, Maps API, and YouTube API.
A GDG can take many forms - from just a few people getting together to watch Google's latest video, to large gatherings with demos and tech talks, to events like code sprints and hackathons. However, at the core, GDGs are focused on developers and technical content, and the core audience should be developers.
GDG Fresno has regular tech talks the first Thursday of the month (see calendar) and has provided hackathons too. There has been some affiliated groups arise like an active local Women Techmaker (see calendar) which meets the third Sunday of the month and information about meeting is through Meetup.