Patrick-Don’t beat yourself up over this. It has nothing to do with how well you know the piece or how long you’ve been playing it. Once the Adrenaline kicks in, all preparation goes out the window.
I wrote two different articles on this subject which were printed in the Harp Column in 2001 and 2002. They are called A PRESCRIPTION FOR SUCCESS, and THE BIG DAY. If you go to my company web site,www.swansonharp.com, and click on the ‘articles’ page, you’ll find both articles there. They should help.