How to be fully effective after a week after practice
In a school trip for a week, when I get back after a few days I'll have some orchestral performances in which I'm the CM. I'll only have a full day of practice when I get back, how can I make the most of it and effectively as possible get back into the mode i was in before?
You should have no trouble. You play well, you are the CM, you know the music. You have not forgotten how to play. You're in an orchestra - so unless you have some solos, no one will actually hear you anyway and if you do, read on.
Agree with Andrew. If you're really feeling shaky, practice the hard bits the most. Or just wing it...
... and while on your trip, practice he tough parts in your mind. It works.
Mental practice is very effective; good suggestion!