After dinner, we felt like some music, n we saw that there's an easy listening concert going on in the Tonhalle, tho we were already 10 mins late, we decided to give it a shot. The guy in the hall told us with pity that the tickets were sold out, so we turned back. As we were about to step out of the gate, the guy came shouting after us "Moment!" He then offered to take us to the balcony seats, but he said that it's not official.
It was really lucky for us and the guy is just so kind. We enjoyed the concert tho it's mainly a religious concert to show the way to heaven.