In Berlin, the beautiful and very multicultural Berlin, there is a very special kind of “festival” to let people come close to foreign cultures, as they are in their countries: All Nations Festival.
June 13, 2015, about 30 embassies open their doors to show their culture and their hard diplomatic work.
Of course is possible to try food specialties, listen music and watch little special typical shows of the country (or countries, if you visit more than one) you are interested.
No special permission are required to join in those embassies in that day, just the identity card and the ticket; the ticket is just one, and is possible to use it all the day, to visit all of them.
The ticket is available at Hauptbahnhof, at the Berlin tourist info point.
More info here.