ANTIQUE MARKET: Every last sunday of each month. 
Frog Free Walking Tour this week suggests you  Antiquariato sul Naviglio
It is a street market famous in town for its furniture, porcelain, books, jewellery, old games, glasses, stamps, bronze statues and much more. The suggestive location of Navigli, the canal of Milan, will follow you from via Valenza to viale Gorizia for more than 2km; 380 selected dealers will offer you a fantastic atmosphere, appreciated by locals and tourists.
We would like to remind you that shops, art studios, restaurants and cafes in the area are open, to give you the opportunity to enjoy a relaxed sunday.
Location:  Naviglio Grande / M2 Porta Genova.
From 9:00am to 6:00pm
You can easily reach the market by public transports:

Metro: Green Line M2 – Porta Genova
Tram: 2, 3, 9, 29/30
Bus: 47, 74, 90/91
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more info:
Frog Walking Tour: Your Free Walking Tour in Milan