There are a lot of things that can go wrong on a shoot, not knowing your camera is one of them. I have shot with people who accidentally changing a setting and could not get back to the camera’s defaults, when you are shooting a wedding or at night, these mistakes can mean you miss the shot.
In my experience, the best option for night photography is to have a tripod and be flexible with your ISO. You can not stop your aperture down any more than 3.2 without loosing focus and you are not going to want to hold a camera at any less than 1/60, 1/50 if you are incredible. The only variables you can use to let more light in are~ actual lights and the ISO. In the case of ISO you have to be careful, anything over 1600 can really pixelate your images. Depending on how large the prints will be this may not matter, but, you want to keep an eye on it and bracket when necessary.
If you are inexperienced, shoot a lot of images to save yourself. Try everything. Bounce a flash off buildings to diffuse the light and use reflectors as best you can. Make sure and shoot RAW and save plenty of time for editing!