Ofosu-Appiah delivered the anniversary lectures in 1969, as well as the eighth series of lectures in 1975 on the subject: "Joseph Ephraim Casely Hayford: The Man of Vision and Faith."
In 1969 and again in 1975, Ofosu-Appiah delivered anniversary lectures and a series of lectures respectively. Both sets of talks were centered around the subject: "Joseph Ephraim Casely Hayford: The Man of Vision and Faith."