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Hi Gary,
If you're there in an official capacity you should be able to call the shots. Be a bit dictatorial and select your spots and ensuring there are kept clear for you and you can move from one to the other.
Depending on where you're shooting from will dictate the focal length of the lens you'll need. It's likely that the 18-105 spread will be more than enough, but I recall it's not very fast (large aperture). This will present you with two problems; it will restrict your shutter speed if you're using available light, and will slow down the auto-focus. If you've got the means to switch off AF and focus manually you may find that quicker. Make sure your WB is set to Tungsten.
If you can check out the venue beforehand, see if they'll switch the lights on for you and have someone stand in the spotlight - try a couple of test shots to give you an idea of what you're likely to get. Try not to use an ISO higher than 1600 and lower if you can.
The in-built flash is not very powerful so you will need a supplementary flash, the most powerful you can afford with iTTL capability. The Nikon SB900 is a lot of money and you may get better value going for another brand.
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