i usually stop practicing hard core about 48 hours out, this just from past experience, as i have in the past practiced so much in the days leading up to a performance that fatigue was an issue. now i tend to only practice performing which is different than 'practicing' in the normal sense of the word. every 2-4 hours i'll play through a work as if i was performing it, that is full concentration, relaxed, non stop. i'll usually start this like i said about 2 days out, normally the day of i try to get 1 run through (sometimes two if i'm not performing a big volume of music) then just relax and enjoy the time on stage, i mean that's the fun part right? we work so hard leading up to these things, the playing for folks is the treat we get rewarded with for paying our dues at the keybaord for hours of hard work.