@bp27 You do not remember correctly about half or more of the speakers were in yiddish.
@Joseph you are also incorrect. The event last time was about 93,000 people. I was there and to say that the majority speak yiddish as well is silly. What is that based on? The daf yomi is a worldwide event people go to shiurim all over the world not just in brooklyn.
Last time they had a system where you would call a number and it would translate the speakers for you but honestly it was a terrible system. Its hard to hear a phone call and to hold a phone to your ear while there is a speaker speaking. The simple solution would be to have english subtitles on the screen.
it is assur to remind a bal teshuva where he comes from so by having speakers speak predominantly in yiddish it has that affect
In addition in many families today, the boys know yiddish because they learn in yeshiva in yiddish but the girls do not.
CTRebbe is 100% right