Free concerts and festival vibes fill downtown Budapest, as 'Belvárosi Fesztivál Piknik' kicks off on Friday. The revelry lasts three days and spans three locations (Szabadság tér – Zrínyi utca – Erzsébet tér), with local bands stepping on stage. That includes Henri Gonzo, the Quimby and ABBA tribute band ABBAbák, but Saturday morning promises entertainment for children, too. On Sunday, you can browse goods at the Markets' Day on Erzsébet tér.