An event for ALL klal yisroel should be geared to ALL klal yisroel even if they are 75 years old. Which is besides the point altogether.
By your (and others) take on things, the event should have been in aramaic, since all sectors learn shas and it is by far the most common understood language.
As I said, this has nothing to do with demographics and everything to do with those behind the event, especially the money behind it. We all know the golden rule. He who has the gold, makes the rules.
Fpor those who don’t get it. Organizers and those who are for it, are two different things.