I've caught myself telling this story every time a student asks about performing and how it looks like professionals make no mistakes. The truth is, there is no professional out there who makes no mistakes. We all do. None of it is intentional, and sometimes life has a funny way of springing curveballs at you.
So if we can't necessarily control our mistakes, the only thing we can control is how we deal with those mistakes. On stage, mistakes are no longer mistakes. They're interpretations! If you've been hanging around the music world long enough, you've probably already heard that phrase. I'll just add that as long as you perform your mistakes as if they're correct, literally no one will even notice that it was a mistake in the first place. Even if they know the music super well, usually they just think it sounded rather interesting at that particular spot. It's all about how you perform it. :)
So, happy performing! Just maybe don't do it while seasick...