It is possible to capture them practising their tricks every night over the Plaça del Angels by MACBA, and soak up a number of the choice vibe by using a 1 euro can of beer from the friendly Pakistani seller. If you want to join in, have a look at https://barcelonatravelguide08529.webbuzzfeed.com/33699110/a-secret-weapon-for-flamenco-shows-barcelona