Just an important note if you plan to join the eFMI forum tomorrow (12th of October 2023) starting at 9:30. The location is not at the conference venue, but instead the Institute for Energy Efficient Buildings and Indoor Climate which organized the conference:
E.ON Energy Research Center at RWTH Aachen University,
Mathieustraße 10
52074 Aachen
Note, that this location is on the city boarder. It is very likely that it is infeasible for you to go there by foot. For that reason, please plan your trip ahead of time (e.g., booking a taxi etc).