This is advice from a smart man, John C.
John,
Try google searching retirement communties, nusring homes, assisted living, alzheimers, and every other name the places go by, them put together a data base of locations.
The next step is to call each of the locations, determine the number of beds, and ask for the activity directors name. Put this into the data base as well.
Then, send out a package to every one of them that looks good to you. Try to be somewhat selective and send full packages to perspective or poptential clients with 100 or more beds--they tend to have lots of entertainers.
After sending the packages, call each of them on the phone, ask for the activities director by name, ask if he or she got the package, and try to set up a meeting.
The rest is up to you. You essentially need to be a salesman and sell your product--high quality entertainment.
Good Luck,
Gary