I went night diving before doing my advanced.
Having said that, make sure that you are comfortable with your gear and setup. Ensure you pack everything so that it's going to be easy to find and setup (will there be lights where you are putting your gear together at the site? If not, make sure you have extra flashlights (I don't like using my divelights out of the water, rather save the batteries for where I need them).
As has been mentioned, ensure that you go over light signals with the folks you are diving with. Ideally, day dive the site before you night dive it. That can really help your comfort zone.
If you dive a computer, know how to activate the backlight. Your gauges should be 'glow in the dark' so get used to shining your light on them before trying to read them. That's all I got on short notice for advice
Good luck and enjoy your night dive.
Bjorn
Edit: I hope you have 2 lights? If so, practice getting to your backup light with your eyes closed. After all, if you have a catastrophic failure, you'll need to be able to get that 2nd light going in the dark. If you don't have 2 lights, go buy a backup.
