“Instead, the event was canceled at the last minute after a small group of people persuaded the Roshei Yeshiva that this event – for Bochrim only – must be stopped at all cost….”
This implies that the event might was cancelled because it was for “Bhochrim Only” . So did the rabbonim who were ready to issue the kol koreh want it to be open for girls as well?? I very much doubt it, even if there had been separate seating. So what was their real objection?