What happened around the occasion, that picture had been taken at: Kanō-shihans lecture about Jūdō had been announced in Viennese newspapers as a public event free of charge. It was scheduled for June 12th, 1933, at 8 pm.
A newspaper article about the event, that appeared some days later, refers to the lecture having taken place in "the hall". That's definitely not, what can be seen on the photos. Additionally, only club-members can be seen in the background of the shots. Therefore I think, for better lighting conditions, the pictures where taken earlier that day at the training area on the rooftop, while the official lecture was held in the hall later in the evening (at 20:00). I also know, that at the same occasion not only photos were taken, but a motion picture for the Austrian newsreel was also produced, that appeared in the Austrian cinemas afterwards. Unfortunately, today it is one of the missing reels, but I want to believe that, perhaps, somehow or other, it will recur some day.
Anyway, there is another newsreel contribution from that location, showing young boy's Jūdō-training from 1936, and therefore from only three years later. If you look at the background, you will recognize that it's the same as on the pictures from 1933 (got to 01:08-02:17):
Boy's Jūdō training in the (so-called) First Austrian Jiu-Jitsu Club in 1936
The political situation was very difficult these days, especially between Austria and Germany. In Germany, the "Nazis" already ruled, and in Austria their sympathizers rampaged on a regularly basis, stopping at nothing, so that even assassinations with firearms or bombs were commonplace. It was the time, when the NSDAP became banned in Austria and German goods were boycotted by parts of the Austrian population. After the expulsion of Hans Frank, the Bavarian minister of justice from Austria, Hitler declared the "Tausend-Mark-Sperre" (in effect from May, 27th, to July, 11th, 1933) against Austria, to further hinder free traffic between the two countries and especially to restrain German tourists from visiting Austria. The goal was, to harm Austrian's economy, of which tourism already was an essential part.
However, it couldn't have been a very easy task for Otto Klimek, to follow Kanō-shihan to Germany, under those conditions. Perhaps he didn't go to Berlin with Kanō, but only joined the seminar in Munich, which took place later, in September 1933, I think.