As well as Brad's good advice above there are perhaps a few more physical and mental offerings. One is to hold your right forearm vertically if front of you as a "bass neck" to help with visualising fingerings or shifts (or a broomstick?) Another is to drum your LH fingertips on a flat surface as though you are playing the piano, using different finger patterns (eg 1234, 1324, 4321 etc) and different rythms (eg even, dottted, reverse dotted) to strengthen control over your fingers. You can mime the bowings with your RH and arm as you hum or sing the part. Find a way to maintain your calluses. Exercise your LH fingers by curling and straightening each against some back pressure from the RH thumb. Also opening and closing your hands from gentle fists to fingers straight to exercise your fortearm muscles. Go for long walks to keep fit. Do you know a form of simple meditation to help steady your mind? Visualise the days of the auditions including what it will feel like to play really well (and perhaps how you will cope if something goes wrong)
Did you take your music with you? Are you stopping in any one place long enough to find a bass to spend some time on? Where are you now in the world and where are you going?
When you get home work to a plan. If any of your pieces needs piano accompaniment organise your first rehearsal ASAP, no matter how under prepared you feel. This should help you identify the passages that need the most work. Pace yourself carefully, getting good sleep, diet and exercise. Play for anyone who will listen to you, especially your family and friends. Take regular breaks in your practice and go outside for some fresh air or a walk to clear your head. Find a larger space to do some practice in so that you are prepared to fill this space with sound on the day, not just your bedroom at home.
You may not want to hear this particular advice but if the auditions are that important would you consider going home early?
Best wishes, DP
