Hi:
Maybe you should hear the clown's side of the story, before you assume they were the one who botched this booking.
Maybe their contract was not signed and returned, maybe the deposit was not paid. Its strange the lady did not remember the name of the performer-clown who they were complaining about. It would be easier to check on the other side, the clown's side, of the story if you had a name.
Perhaps the client did not properly book this clown and take the necesary steps to confirm the booking, and the clown thought the event was not "on". Sometime a client calls for a quote, requests an indefinite "hold" on a date and time, without confirming (giving themselve the option of confirming or not going ahead with a booking), and then gets dissappointed when the clown get's another booking.
A professional clown wants to fill their schedule. Confirmed bookings pay our bills and "maybe"-tentative bookings, well ... might. A bird in hand is worth two in the bush.
In general, I consider myself available for dates and times until they are booked. Holds can be made for short defined intervals before they are considered "very tentative", and possibly unlikely bookings.
Just saying .... there are two sides to every story and it is possible this unnamed clown had legitamate reasons not to appear.
Jonathan Seglins
www.circusjonathan.com