I'm from Italy, and this is my first post here, so I'd like to greet to all the travellers who frequent this site!
I'm going to visit Lisbon with my wife in the 4th week of August, and we both like to visit small markets, to scrutinize the stalls, to visit fairs and exhibitions. Are there interesting things to see in that period? For example, I read about the "Feira da ladra", an outdoor antique trade market.
Try to visit Feira de S. Pedro, in Sintra (not far from Lisbon): sunday 28, as well as Feira da Ladra, in the very heart of medieval Lisbon, every saturday.