If you get up to dance in a New York City bar, you’re breaking the law. “Call it whatever you like—writhing, shimmying, bumping, grinding, ‘the white-man’s overbite’ — but if three or more people are executing it in a bar, nightclub or music hall that does not have a valid New York City ‘cabaret’ license, the establishment will be fined. If such “violations” occur again, they can be padlocked.” Now the city is thinking about revising the 77-year-old law…