It's really a personal thing. Some people like the feel of new strings, some don't.
I personally like new strings for the first hour or so of play (they feel nice and springy to me), then I don't like them for the next 3-4 hours of play (feel boardy), and then after that they settle into 'normal' feel for the rest of their life.
In your case, why not restring, and then use the racquet for a few hours before the tournament to help the strings settle in? If you can't find someone to play with you could always hit against a wall or practice serves.