This is excellent! Thanks for sharing, Mia.
The New York Public Library's Schomburg Center for Research in Black Culture, a highly regarded research institute specializing in scholarship on the African American experience and the African Diaspora, is named after Arturo Alfonso Schomburg.
The Schomburg Center holds a "List showing the theatres and plays in various European cities where Ira Aldridge, the African Roscius, acted during the years 1824-1867" and a book titled "Ira Aldridge, the African Roscius." Judging from the New York Public Library's (NYPL) catalog, both appear to only be available for on-site reference viewing. I don't think either can be accessed in digitized form at this time.
However, there is a NYPL blog post titled "Live from the Reading Room: Arturo Schomburg to Langston Hughes," that discusses a 1933 letter in which Arturo Schomburg mentions his interest in acquiring an image of Ira Aldridge to Langston Hughes: