The speakers, all of blessed memory, were:
Rabbi Alter Hilvich, Rov of the Chabad Shul in Johannesburg and an editor of the first volume of the Talmudic Encyclopedia
Rabbi Chaim Zen Finkel, Rosh Yeshiva Heichal Hatalmud in Tel Aviv and son of Rav Nosson Tzvi Finkel OBM
Rabbi Menachem Porush, member of Knesset and Chairman of the Agudas Yisroel party
Rabbi Yirmiyau Alay, Rosh Yeshiva Tomchei Tmimim in Glubaka, Lithuania
I believe he was a grandson of Rabbi Nasan Tzvi Finkel, not a son.