Chicago’s indoor flea market at the Randolph Street Market Festival is a seasonal, curated shopping event where vintage lovers and treasure hunters can explore hundreds of vendors inside the historic Plumbers Hall. During the fall and winter months — especially at Holiday Market weekends in November and December — the focus shifts to 125+ indoor dealers offering antiques, vintage fashion, handmade artisan goods, décor, global finds, and unique gifts all under one roof. It’s more than a typical flea; with live DJs, festive food and drink, and a lively atmosphere, it feels like a celebration of style, history, and design rather than just bargain hunting.