The 5th Annual Open Source Digital Forensics Conference (OSDFCon) will be held on November 5, 2014 at the Westin Washington Dulles in Herndon, VA. This conference focuses on tools and techniques that are open source and (typically) free to use. It is a one day event with short talks packed with information. There are both tool developers and users in attendance, and this is a unique opportunity to learn about new tools and provide feedback.
As an investigator, you should attend to learn about new tools and meet the developers building the software. As a developer, you should attend to raise awareness of your efforts. Everyone should consider submitting a talk to share their experiences and work.