The Free University has a helpful website with information on how to get to Dahlem and a downloadable PDF map of the campus.
Free University of Berlin
The closest U-Bahn station is "Dahlem Dorf". All of the talks will take place in room 340.
How to get there: http://www.jfki.fu-berlin.de/en/information/visitingjfki/index.html
The conference hotel is right across the street from the JFK Institute.