This should be the starting point for your research! It contains approximately 1,462 plays by 233 playwrights, together with detailed, fielded information on related productions, theaters, production companies, and more. The database also includes selected playbills, production photographs and other ephemera related to the plays.
For over 25 years, the Black Theatre Network has collected, processed and distributed information that supports the professional and personal development of its membership (comprised of representatives from all areas of theatre, community and professional organizations, and academic institutions)
The IBDB provides records of productions from the beginnings of New York theatre in the 1700's up to today. Details include pertinent people involved as well as interesting facts and production statistics.