The symposium will be held at the Department of Computer Science of Freie Universität Berlin, Takustraße 9, 14195 Berlin. Click here for directions.
To get there (and around in Berlin) we recommend public transportation. You need only one ticket for all kinds of public transport: U-Bahn, S-Bahn, bus, tram, regional trains, and ferry. There is a zone system with three zones (A, B, and C), but it is very unlikely that you will need C. The only two notable exceptions are going to and from Schönefeld Airport and visiting Potsdam. A single ticket costs about 2.70 EUR and a day ticket (Tageskarte) is about 6.90 EUR. Don't forget to stamp the ticket before using it. More on public transport can be found here.
To navigate you can either use the “offline” itineraries at each station or a suitable app (e.g., Google Maps, Öffi, BVG App, etc.). Here are three example connections from the two airports and from the central train station (Hauptbahnhof): Schönefeld Airport → CS Department, Tegel Airport → CS Department, Hauptbahnhof → CS Department.