I would like to strongly recommend the services of VocalEye audio descriptive services. Bringing the pleasures of theatre to the visually impaired is a noble calling indeed. The staff embodies courteous service and cooperation and are a true pleasure to work with.
From a purely technical standpoint; their use of FM, as opposed to UHF, VHF or IR, transmitters means the elimination of potential interference with most theatres microphone and communications systems. They require little more accommodation than reasonable proximity to their clients, some isolation and a source of program sound. How could it be easier?