The Fermi 2017 Symposium will be held at the Conference Center Garmisch-Partenkirchen (in German: Kongresshaus). The address is
Richard-Strauss-Platz 1A, 82467 Garmisch-Partenkirchen
It is located close to the city center of Garmisch, and within walking distance to the railway station (900 m, 10 min), as well as to most hotels.
Below is a picture of the Conference Center for an easier find, but it is hard to miss.
And below two pictures from the inside: Entrance (top), and the actual meeting place (called Konzertsaal Richard Strauss).