Example 1: build a local representative / election tracker. Users could track news about particular local office candidates that terminates after election and notifies users of election days. Or, users can track documents, data, or news produced by particular local government offices, departments, or officials. It might notify users of upcoming election with open positions or point users to documentation for running for local office.
Example 2: build a charity help request app (anything from handing out food to manual labor) where volunteers can accept help requests and search for volunteering opportunities by charity, type of labor, date and time, location, time commitment, etc.