A Gipsy Band!

Back row: Mary Tyreman, ??, Elsie Trillo, ? Cush, Mary Trillo, ? Cush, Alice Hogan.
Middle row: Monica Swales, Denis Brown, John Readman, ? Cush, Henry Dale?.
Front row: Gus Swales, Jimmy Cush, Chris Stonehouse, Frank Trillo.

Can you help us with the missing names from this motley crew, the date and the name of the production?
Image and names to date courtesy of Maureen Hogan.