From their Meetup Page:
The GA 400 Linux Group has been started to allow the casual to advanced Linux users to get together and share ideas, knowledge, and face-time with other Linux users. We're focused on helping beginning and returning Linux users learn the basics by establishing a solid foundation. We'll discuss distributions, file systems and storage, installation, databases, networking, and more!
Looks like they have informal weekly meetups at a pizza place, and more formal monthly sessions.