You can find further information on the allocation of remaining seminar spots under the following link (German). Please follow the instructions given there, if you are interested in participating in a seminar, but have not a spot yet.

https://www.wirtschaftsinformatik.uni-koeln.de/de/news/neuigkeiten/restplatzvergabe-fuer-bachelorarbeit-bachelorseminar-und-advanced-seminar/