Madewell is temporarily converting into a vintage store. Starting this week, the locations in Soho and East Hampton will debut a special section featuring clothing and accessories from Brooklyn Flea vendors, who regularly inspire the Madewell stylists. The partnership kicks off this Thursday with a party featuring Nunu Chocolates, Salvatore Bklyn snacks, and a microbrew from the Brooklyn Brew Shop, and the goods themselves will be stocked in a structure made of tree branches (earthy!). It’s a nice alternative in case you can’t make the trip out to Brooklyn. Madewell Soho, 486 Broadway, at Broome St. (212-226-6954). Party: 6/25, 68 p.m. RSVP: firstname.lastname@example.org.