Final answer:
A public relations agency or event management company would be responsible for preparing news releases, promoting, and managing a concert to raise funds for 'The Little Ones' orphanage, due to their expertise in such events.
Step-by-step explanation:
The specialized service responsible for preparing news releases, promoting, and managing a concert for 'The Little Ones' orphanage in Houston would be a public relations (PR) agency or a company with expertise in event management and promotion. These professionals possess the skills and experience to handle all aspects of event planning, from creating press materials and engaging with media coordinators to ensure wide coverage, to coordinating with various organizations for the implementation and marketing of the event. Employing strategies like intentional marketing, which focuses on the shared interests and activities to be offered rather than the cause alone, can help in attracting a diverse audience. Moreover, the agency can handle the solicitation of donations from sponsors, partake in the creation of event programs, and manage publicity and fundraising efforts.