I am praying that, A., you don't hurt yourself, for crying out loud, and that, B., the Spirit grants you peace so that you might be calm and collected in front of those people, which will, if not improve your playing, keep you from making mistakes because of your nerves.
For it is not you that speak, but the Spirit of your Father that speaketh in you. Matt 10:20
For it is not you that [play], but the Spirit of your Father that [playeth] in you. Fixed!
Have you considered dedicating the performance to Our Lord and Lady, and playing to them, not to the audience?