Whoa Nelly! Practice once a day setting the tempo deliberately too fast - at a speed you know will cause mistakes. It'll help make problem sections seem slower and more comfortable (after you slow it back down, of course) and will s - t - r - e - t - c - h out the song more, giving you a more relaxed feeling with the song - afterwards when you bring the speed back to normal. Once a day.
Day before the concert: focus on solid, natural, what works. Slow problems down til they feel natural. Perform. Remove problems from piece.