Mekelburg's is equal parts hipster bodega, bar and sandwich haven. I always go for the cheese counter, the babka and the late night fried chicken sandwich, which is hands down one of the best I've had in NY.
I probably frequent here twice a week, because I am obsessed with Mexican food, and I'm fortunate enough to live in close proximity to this place. Taqueria Tepango is definitely a sapphire in the rough since there are a lot of terrible/over-priced Mexican restaurants in NYC.
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.