Geosociety.org is the official geological society of America, as stated in their website. The Geological Society of America website offers various membership options for recent graduates, or even professions in the geological field. These subscriptions allow professionals to learn about the latest advances in geology, and include other benefits such as the ability to publish and present research you have conducted yourself.
Geoscoiety.org also offers various workshops, and anyone may attend as long as they have sent in an application. Geosociety.org offers great information for future geologists, and allows professional geologists to further their skills.