More than 100 app developers, designers, entrepreneurs, marketing experts, private citizens and government officials will descend on Seattle City Hall for 54 hours this weekend to share ideas and create public-inspired mobile apps using government data.

The gathering, hosted by Startup Weekend, is the first event ever dedicated to developing government-oriented mobile apps in the Seattle region. The new apps will pull data from the City of Seattle, King County, and the State of Washington. The apps will be created from scratch and use real-time info, much like the locally built app OneBusAway uses data from King County Metro.

Tonight is an open-house where the public is invited to share their ideas for needed apps. On Friday night, after speeches from the mayor and council members, projects will be picked and teams formed. Then, on Saturday, mentors from the three governments will give talks and help the teams develop their ideas into actual products. Finally on Sunday the projects wrap up, followed by presentations.

Tickets are still available to participate in the coding marathon, or you can come to the free open house tonight starting at 6 p.m. in the Bertha Knight Landes Room at Seattle City Hall, 600 4th Ave.

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