... by train
If you decide to come by train, check out www.bahn.de for the right connection.
... by car
Cologne is located in the western part of Germany at highway #1 and #4, the Koelnmesse where the festival takes place, is right in the center of town. Find directions and parking spaces in the area on the website of the Koelnmesse.
... by plane
... once you are in Cologne
The KoelnMesse is located at the river Rhine opposit from the world-famous Dom. Look out for station "Deutzer Messe", from there it is just a short walk to the festival.