CAMBRIDGE, Mass. — JPMorgan Chase CEO Jamie Dimon and Detroit Mayor Mike Duggan will be at Harvard University to talk about rebuilding Michigan's biggest city.They're scheduled to speak on campus Wednesday at a discussion titled "Invested in Detroit ." It's being hosted by the Harvard Kennedy School's Institute of Politics.New York-based JPMorgan Chase says it plans to invest $150 million in Detroit by 2019 as part of its philanthropy efforts.