#1
What are some of the things you guys do in the few days/week before a big (or any) show to get ready or prepare for it?
#2
Play the songs loads, make sure you've got everything right, you're playing/singing in tune to every bit and playing in time, and make sure you feel confident.
"Breathe, breathe in the air
Don't be afraid to care"

Fender Strat/Tokai LS80>few pedals>Orange Rocker 30
#3
I put new strings on the guitar and make sure that the entire band knows all of the songs (yeah extra last-minute rehearsals have happened like a day before the gig).
Other than that : relax as much as you can before the gig

Right before the gig : go to the toilet, drink some water, if you're nervous then make sure your breathing is relaxed.