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 1975, Ofosu-Appiah gave talks marking anniversaries. Both sets of lectures focused on Joseph Ephraim Casely Hayford: his vision and faith.