On May Day this banner has been hung on the Aachen Cathedral, as you can read here (german). It speaks for itself, and certainly many can agree with it.
See the pictures below

Also otherwise currently a lot is offered in Aachen: This weekend there will be a big party in the AZ, which is starting already today! Besides of that, the exhibition about the Hambach Forest is going on in the Nadelfabrik until 13. May 13th.