Intel is sponsoring this nationwide event for the second year, and Code for Seattle is hosting it locally at Seattle City Hall. Check out some great local grassroots projects that people in the community are tackling to increase transparency and take advantage of data that local through federal government agencies are releasing.
I expect Richard Schilling of Synapse will be taking part. Rex St. John of Intel's Mashery will likely be there with their Galileo development platform, which is a competitor to Arduino. Should be fun for the HW Hacker set, as at least one HW challenge is in play at this event.