I recommend to contact the Stadium itself.
Some documentation: https://olympiastadion.berlin/en/history/
btw: close today Theodor-Heuss-Platz was named Adolf-Hitler-Platz from 1933-1947 and planned west-end point of the world capital Germania axis - not my formulation of course.
In German text sources you will find many detailed information about the event, e. g. this article of a German authority. For translations I recommend DeepL - also available as app or browser plug-in.
Another great source of information is the federal picture archive of Germany. I prepared a search for you (Olympia, 1933-1939).
Tip: Multi-awarded Berlin History app might include more useful information.
One more thing to know: the stadium was "new" added to Berlin by Greater Berlin Act from 1920. And old Berlin had a very different reputation compared to close Charlottenburg.
Personal highlight: my 83 yr old mother lives "around the corner" in Westend (German saying). Tip is breakfast at Wiener Conditorei Caffeehaus near subway U-Bahn station Neu-Westend. From there walk down Olympische Strasse to the Stadium.