Betrunken am Boulevard [Blackout Boulevard]

Permanently Closed - Your exuberant bachelor/bachelorette party ends in a blackout. You only vaguely remember yesterday evening on the Boulevard in Bielefeld. There is no time to relax, because the wedding ceremony is about to begin. Let's go to the registry office! But wait... the wedding rings have disappeared. Have they been stolen? Have you lost or misplaced them? The only thing you remember: You were in a scrapped hotel on the Boulevard in Bielefeld. Are there perhaps some clues?