Jay S. Daughtry, ChatterBachs
Sharon, the DC area is rich with national and international associations which host conferences, seminars, and other events throughout the year. You can reach out to these organizations and ask for a Director of Meetings or Conferences or Event Coordinator or similar title to ask who has this responsibility for speakers. I think you'll find a helpful community in associations. Let me know if you have questions or if you need more specific guidance.