Westwerk.

In the location's words:

Westwerk is a gallery. Westwerk is a club. Westwerk is an old building in the centre of Hamburg. Westwerk is a group of artists and creatively minded people who maintain and programme this location as an off-space, an art gallery, a music club, a site for installations, performances, readings and events on the ground floor of an artists' house located
in an old building in the middle of Hamburg's city center.