2500 yards west of the concert hall, there will be a black car, with a driver in a suit and sunglasses. Once there, answer the phrase "The rooster crows if the aardvark sleeps," with "only the sweetest of dreams, my friend"
A black bag will be placed over your head, as to not reveal the location of the tower you will be dropped off at.
Once dropped off at the tower, climb the spiral staircase to the top level, a man by the name of arty will be there, who will give you the key to the basement. The basement has an old wwi tunnel, where the higher figures would transport themselves to several locations. Walk straight untill you reach a fork in the tunnel.
Pour water.
The water will flow downhill, towards the correct path.
1.2 miles in that direction will be a ladder, climb this ladder, and avoid detection.
This leads you to a supply closet, backstage.
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profits