Conversation so far:
Where were special screenings of The Birth of a Nation held?
Birth of a Nation was the first movie shown in the White House, in the East Room
When did The Birth of a Nation special screening in the White House happen?
Birth of a Nation was the first movie shown in the White House, in the East Room, on February 18, 1915.

Question: Who arranged the screening?
Self-contained rewrite: Who arranged the special screening of The Birth of a Nation in the White House?