|| A qualified Posek (Rabbi) can certainly disagree, and even I won't jump down his throat. However, that Rabbi Aharon Kotler did not object to Irving Bunim speaking at such gatherings is certainly not enough to prove that he held it was OK. Did he know what they were doing? Did they ask him? Did he feel that it was better not to say something that they wouldn't listen to? Did he figure that this was better than people going to work on Shabbat? We cannot use such things as proof.
I understand you are mispalel with Rav Yehoshua Kalish, my cousin. I'll ask him what he thinks and I'll post his answer. DW