D.C.: If you can make it here, you can make it anywhere. Wait, isn’t that New York? Regardless, 14th Street boutique Pop recently expanded to open a second location in hipster haven Williamsburg, Brooklyn (308 Grand St.). If you’re Brooklyn-bound, on Saturday from 5 p.m. to 10 p.m. Pop is hosting a shopping party boasting DJs, drinks and discounts, which just so happen to be our three favorite “D’s.” Even if a weekend trip on…