
I know how you feel.  It's the end of the summer, some teachers are still out of town, it's hot, and everyone wants to just enjoy the last bit of the summer.  That said, you do have to practice.  : )  
What do you mean, you have nothing to work for?  You can always improve.  Tone and intonation and all those techniques will help in orchestra auditions, competitions, etc.  you should ALWAYS be improving.  I just got some work done on my violin, and I can really tell a difference.  It has motivated me to practice.  I know you don't want to send your precious out of town, but if there's anyone in town you might get it looked at if you suspect anything's wrong.  The smallest changes can make a huge difference, especially on a violin.
I agree with what Sydney said about imagining all the competition working their butts off, which may very well be true.  Hang in there, and don't give up! 
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