Time Out says
Once again the Casa Sagnier civic centre joins the Festival of Fair Trade and La Banca Ética de Barcelona with a clothing-exchange market. Other distributors throughout the city will also participate this year. Just donate clothes you no longer wear (max 10 pieces) between April 27 and 30, and you'll get points to exchange them the day of the Festival (Friay, May 8). Find out how it works and get more info on the civic centre's website.