Referred to at the end of 724B, a group of the Rav's closest gathered to hear him give a gemara/halacha shiur to honor his father's neshama. Although given in Boro Park where the Rav usually speaks in Yiddish, as a courtesy of those of us who are not that fluent, he spoke in English.
May his father's neshama have an aliyah and may the knowledge imparted here penetrate deep into our hearts.