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.
Summertime in Bushwick, means the locals will be barbecuing on the sidewalk, and playing in the hydrants. It's the perfect time to grab some shorts, and run down the street. If the one outside Mckibben isnt going off, one of the other 15 hydrants in the neighborhood will be.