Thanks for the input, guys. In essence, it would be an extension of repetoire. I presently perform kidshows and if I'm going to try anything new of that nature, I merely introduce it into a few gigs and see what the take up is like. If it works it stays in & if not then it doesn't. Interesting point about one's existing "show" moodini - on a repeat performance, I was asked to do "the thing you did last year with the balloon". So some audiences do not necessarily always want something new and you will indeed get booked on the basis of your existing show.
However, I wish to augment existing line of services with a more adult (as in older not XXX rated

) show, hopefully introducing a comedic element. In a couple of extreme examples, say Max Maven wanted to put together a kidshow or David Ginn wanted to concentrate entirely on card magic, I was wondering how would they go about testing the new show? In the first example, Max Maven may have to give consideration to changing the image (unless it's a Halloween themed show

) - therefore, image is important, as is content, pacing, etcetera. It just finding a forum upon which to test drive (totally) new material - possibly free gigs