Licence to dance

I learnt something about NY. If you run a bar, and you want people to be able to dance, you need a licence.
Anna and I just went to a piano bar/open mic thing where the waiters were musical theatre actors combining their waiting job with taking turns at singing, and basically anyone could make a request to sing, and there was a sign up that said 'please no dancing'.
I laughed at it when I first spotted it, but an hour or so later a couple started dancing and the barman (who just finished his lot of songs) told them to stop. So we asked him what the deal was, and he explained they didn't have a licence for dancing.

NY is a strange city.