The approach by car is described here:

https://www.uni-wuppertal.de/en/university/address-location/travel-site-maps/main-campus-grifflenberg-by-car/

The most of the university parking garages and parking lots are freely accessible to everyone. A parking permit is not required for this purpose.

Please note the general opening hours of the parking garages (exceptions are possible at special events):

• Mon - Fri: 7:00 to 22:30
• Sat: 7:00 to 22:30 (only parking garage PA), closed (parking garage PB and PC)
• Sun: closed

The approach by bus is described here (in german):
https://www.wsw-online.de/wsw-mobil/fahrt-planen/linienverkehr-zur-bergischen-uni/