This is one of my favorite bars in Manhattan. It has a courtyard in the middle and they only serve a large selection of Belgian beer. It's always dark with red lights so it's like a giant darkroom with everyone developing hangovers instead of film. The courtyard creates a front bar that is open on the weekends, so if you get cornered talking about architecture you can escape over to the front bar and watch people walk down 4th street.
I think it takes place every Saturday morning to afternoon, vintage shopping while having a great view at the Manhattan skyline from the East River State park. You will find lots of vintage shops and warehouses around this area of Williamsburg.