If the local police wanted to shake you down then they would have, for just 20 minutes, for receiving no monies, is irrelevant.
A guy I know decided after his bar/restaurant had shut to play with the Decks, mixing sounds he liked, there was a couple of staff present clearing the last glasses. The police walked in straight up to him and asked to see his work permit, as it didn't include DJ'ing he was taken straight to the police station, big fine, he refused, put in the cells overnight and still had to pay the fine the following day, and it was a big fine!!!
!0 minutes of playing with the decks!!! but they had arrived to shake him down anyway and heh ptresto there was the excuse!! if not the decks they would have got fhim or something else!!