Thanks, I dont doubt the originality- came from a great collector, I was just looking for information as to a possible year and what event or meeting it may have been was for.
I don't know the year but it was definitely post-April 1937 because Gebiet 26 Hamburg did not exist before that date. The event was a HJ Gebiet-level tented camp which catered for all male units within Gebiet 26 Hamburg. Many thousands of kids would have been rotated through the camp for a stay of up to two weeks where they engaged in sporting activities and other things central to the ethos of the HJ. It was essentially a holiday for these kids and the poster would have been an advertisement for the event.