To the OP. This is not meant to be a smart @$$ post. You need to understand that every situation is different. Lighting in every situation is different. There are no magical exposure settings that we can give you. The art of photography is the art of understanding and painting with light. That is part of owning a camera such as a DSLR. The photographer has to know and understand light and the exposure triangle. This is a good place to learn the basics: Digital Photography Tutorials
If you don't have the time to learn and practice before this event, then I am going to suggest that you put you camera into Auto or mode, attach the SB900 and put it into TTL mode and use the thing as a big P&S for this event. Then follow the steps above. If you don't understand the operation of your camera then the rest is pretty much useless, so read and understand the manual and your gear first. Bryan Peterson's book is virtually a must have for new photographers and Cambridge in Color tutorials are easily understandable by most go give you a basic foundation to build upon.
If you don't have the time to learn and practice before this event, then I am going to suggest that you put you camera into Auto or mode, attach the SB900 and put it into TTL mode and use the thing as a big P&S for this event.