I make mental notes on how people prepare for their 15 minutes of fame. Did they spend a lot of time preparing or do they just wing it when they get up there. Some drink a lot of beers, others indulge in crops from "Bob Marley's Farmer" and some are just stone cold sober. In the past I have gone "Rock Star" , where I'm out of my mind and can barely stand up by the end of the night.
My intent when I play is to get something out of it other than violent vomiting the next day. It's an opportunity to make the most out of a short period of time. I do the best I can with the time that I'm given. I take this same approach when making a photograph. Preparation is key to doing anything well but I think you also have to be open minded enough to go with the moment and follow your instinct and not be afraid to explore an idea that comes to you. I believe this is a similar approach that Jazz musicians take. We have a beginning and a end and what happens in the middle is the reason why we do anything.
I like having timelines set for me, it puts a certain amount of pressure on me to not over think things and just start doing.