@Paul:  Definitely like being prepared, and having had the good fortune of playing in a band for several years that had a dedicated lineup of people I have an appreciation for the tightness that kind of situation brings.
 
I think the gigs are supposed to be fairly high profile, hence my apprehension.
 
Anyway, should be interesting.  I don't get that many opportunities to play these days so it should be fun!

Some of the tightest bands I've gigged with were unrehearsed.  As Briant stated, if everyone knows who is driving, knows their instrument and listens, you're good to go..
 
John