Holding back

I have a potential gig tonight back and Day & Night (weather permitting) and tomorrow I will be playing for about four hours at a wedding reception. I must tell you, I'm thinking that I will have to hold back and pace myself on Friday night in order to last for four hours on Saturday night. I've never liked playing passively, but it will be in the back of my mind while I play tonight. Anyway, here's hoping I don't develop new blisters until after Saturday night.