Invitation to the ball

Exploration Stage: City Hall
From: Detective
Description: If the Mayor still hears the voice inviting him to the ball, maybe we should forget about the eternal pain and join him? What was it he said? Every night as precisely midnight, a portal opens and the voice of the Mistress calls everyone who was invited to the centennial celebration! What if Mike Stone used one of the invitations and ended up at the ball?! What if the key to the mystery of Mike Stone lies in the past? Damn this city and its secrets! We just have to get to the ball! But where can we get an invitation?
Completed: There are so many of them! So... one of them is the Mayor's. But it's in bad shape, so let's leave that one. Then there's... Dr. Frankenstein. I didn't know he was already in the City by then. And then there's the Master... For some reason neither of them attended the Centennial Ball. We should think about why when we get a moment.