The Hoover Institution will host another "Policy Boot Camp" August 16-22. See here for details and how to apply. It's a one-week survey of serious policy analysis.
The program includes economists such as John Taylor, Ed Lazear, Amit Seru, Caroline Hoxby, Erik Hurst, and yours truly. Learn about international affairs from H.R. McMaster, Jim Mattis and Condoleezza Rice. Niall Ferguson on Nationalism vs. Globalism and Bjorn Lomborg on climate should be worth it all on their own. And many more.
It's designed for "college students and recent graduates," but I think that is a bit elastic. Food and lodging free.
Update: in response to a commenter. Yes, PhD students and even those a year or two out are welcome.