One time I was enough lucky to visit a “Festival of giant dragons on Tempelhof feld” which took part a few weeks ago. More info about this place you can find in previous post.
More a family event when parents with their children come to the field and set up kites in the sky. You can also observe another enourmous balloon constructions, for instance – 40 meter long dragon
The nice thing that admission is always free and in the evening there are some fireworks to entertain Berliners.