A concert and lecture course to be given in Sanders Theatre has been announced under the auspices of the Cantabrigia Club and the Cambridge Welfare Union. On Tuesday, October 21, at 8 o'clock, Roland Hayes, the famous negro tenor, will sing. On November 21, Angelo Patri, New York educator, will lecture. Frederick A. Wallis, Commissioner of Corrections in New York City and formerly U. S. Commissioner of Immigration at Ellis Island, will speak on January 15, and on February 18, Suzanne Keener, soprano of the Metropolitan Opera Company, will give a song recital.