The weekend's events begin with a Community Needs Assessment---and happy hour!---in the City Hall Caucus Room on Friday (5:30-8:30 pm). It's free, but registration is required. The actual hackathon (that's where needs become apps) happens Saturday (9:30 am-10:30 pm) and Sunday (10 am-5 pm) at a location to be determined. The cost for that is $10 and includes meals and snacks. Register online.