If in performance, you mean in the Performance Arts, I'll redirect you to this thread:
http://www.boredofstudies.org/community/showthread.php?t=45557
As for Nepean. Nepean is the previous name for the Penrith campus. Theatre Nepean is the production name of the Performance/Acting course, stagings of which are usually at the campus Playhouse or toured elsewhere in Sydney.
At the moment it will seem that the Performance course is the only opportunity for performance at UWS, as there isn't any drama/theatre student clubs (at the moment; next year's formation of a new, combined student association might give us some chance to start one up).
Any other questions?
-andy
B Performance Theory & Practice (Theatremaking) @ UWS