Well, I'm back from the gig and it went well although I feel like I've been through the mental wringer. One thing that dawned on me last night was: This group has a horn section, which means... flats. Lots and lots of flats in the key signatures. And I was on the money with that one. You really haven't lived till you've sight-read an uptempt Brazilian dance piece in D-flat at regluar tempo with a VERY talented band.
I see what Christopher meant about the downbeat and following the percussion. Good advice there. This group has a drummer and a percussionist but unfortunately the perc. guy didn't show up.
The group had a very detailed library of charts, but one thing I found was that in some places (such as the D-flat piece) trying to read the notes on the page was just confusing me... so I tried to listen for the patterns in the line and just follow those. I noticed that when I detached from the sheet music like that, the drummer was a lot happier.
So I had a good time, made some new musical acquaintances, and learned a few things about playing this kind of music. I got lost a few times but didn't panic and held my own. I think that got me a lot of good marks from the band members. So it's all good.