If Bjorn were to pinch just before a show, it would be the morning of the show or maybe the day before. They will brown a little.
But really, guys, there's no compelling reason to pinch, and you get better results if you don't.
Vance says on this or another thread that his favorite book on bonsai was Yugi Yoshimura's book published in 1957. I, too, got my start from that book. I read it, re-read it, many, many times. But, come on, the techniques in there are over 50 years old! The state of the art has progressed since then.
New techniques are being developed all the time. I hope I never stop learning new techniques. (Heck, I'm still trying to Master the existing ones!)
Anyway, I hope everyone has learned something from all this!