On Monday at 7 p.m. , a free panel discussion on teaching about slavery in New York City schools , with Louise Mirrer , president of the New-York Historical Society , and Howard Dodson , chief of the Schomburg Center for Research in Black Culture , will be at the Schomburg Center , 515 Lenox Avenue , at 135th Street , Harlem ; information : ( 212 ) 491-2206 .