Do your normal warm up. Go thru your program in reverse order. On each piece practice starting, review transitions or tricky spots (DON'T rehearse them) The last thing you do after this is play thru the intro to the march once so the last thing they review is the first thing they play in performance.

Review your sight reading process.

Be positive, confident and calm no matter what happens. Never lose your temper the day of a performance.

And just remember, whatever rating that band gets, it's your fault.