The annual street festival in Hamburg’s Eppendorf quarter is one of the biggest in this city. There are some stages for live shows (no big acts, generally some local musicians backed by a radio station) and lots of food stands.
Some social organization present their work there – you’ll know where they are located because there are fewer people walking there. The festival occupies most of the Eppendorfer Landstraße. So on one end we have the social organizations and on the other – the flea market. Used by professional and amateur sellers alike you can find a lot of things there if you are into the typical flea market second-hand junk. Well, I haven’t found anything there in ages.