The police were there in force in an attempt to stop the monthly critical mass bicycle ride in Union Square Park.
Friday night's Critical Mass bike ride was a First Amendment battle over the NYPD's new parade rule, which requires groups of 50 or more to get a permit to be on the streets.
There were arrests, 46 summonses issued to cyclists. The cyclists were greeted by a police blockade on Park Avenue, after traveling only about a block out of Union Square.
Although all of this was supposedly done to enforce the new law regarding parading without a permit, none of the Critical Mass riders were actually ticketed for parading without a permit.
You can read more about other incidents associated with this "surge" here.