Looking for something to do on a lazy Saturday? You could always learn a little more about Open Hardware initiatives. Today, March 15th, is Hardware Freedom Day -- an annual celebration of open-source gadgetry and unrestricted hardware collaboration. The Digital Freedom Foundation created the event in 2012 to promote the idea of Open Hardware and give local hackerspaces a chance to interact with their communities. Local events are being hosted on almost every continent, exposing everyday folks to fabrication tools, Arduinos, Rasberry Pi hacks, 3D printers and more. Check out the official website at the source link below for details and event locations.