Make sure your equipment is in good order:
Violin in tune, bridge straight, bow rosined and properly tightened, etc.
You may be "assigned" specific etudes/exercises for future improvement. Do not be embarrassed, you will be playing for a person who does "know it all."
If you are one of those people whose right arm has a tendency to shake in live solo performance, there is no need to fear playing in a masterclass - all those people can "see through you" because of their own experience and knowledge. You are not there to entertain or impress - just to learn.
If I were taught by a master, I would hope they not work on intonation or timing or how to rosin the bow.
When I played some Beethoven for Joseph Silverstein (not too terribly well), he talked about making 4-bar phrases more obvious. For Brahms, he always loved speaking about rhythms and cross-rhythms. For Bach, there were a few tricks he would show with a baroque bow each time-- and a general admonition to think about dances.
I don't mean to sound cynical-- but be aware that the event is as much for the teacher to talk to the audience as it is to criticize your playing. Do your best, and remember that everyone else will also sound less good than they are.
I find them pretty interesting as an audience member, as much for the performance as for trying to follow the train of thought of the teacher and then seeing if it actually impacts the student in any way.
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