This year's Nikolaus Conference at Lehrstuhl D für Mathematik was held
This time we had at the same time the
Everybody was welcome to attend the meeting. You could have mailed me for further information or assistance with booking accomodation.
Look here to find a train connection to Aachen.
Once you are in Aachen you find Lehrstuhl D in the building Templergraben 64, 2nd floor. Here is a map of the city center.