From the event organizers:
“The robots return to Stanford on April 10 during National Robotics Week. The Robot Block Party is an annual robotics festival organized by Silicon Valley Robotics, with Stanford Robotics Club and the Stanford Center for Internet and Society…2,000 people came to the 2012 Robot Block Party, to see more than 30 companies and groups on exhibit, making this one of the largest festivals of National Robotics Week.”