I reckon mentioning the playwrights would suit the small theatres better, as we/you have already mentioned such playwrights. Something along the lines of:
The most performed plays were written by famous Athenian playwrights (or however it goes) such as Euripides and Aeschylus (there already is a quote from this guy in the loading screens).
Moving on to the oideia, something along the lines of:
Epeirote Great Music Hall\n\nAdvances in architecture had given Hellenic craftsmen the skills and confidence to build larger oideia. A mega oideion have columns spaced wider than their smaller counterparts, thereby allowing everyone a view of the proceedings, as the columns were not obstructing the view. etc etc.
I realise it's probably not the best, but at least it mentions the problem.
EDIT: Marvelous or marvellous? American or British?
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