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Well, you'll need the flash for sure. If you're shooting lots of quick shots in succession, you can cut the flash output by 1/2 and bump up the ISO (at the risk of noise). This will allow the flash to recycle faster.
Other than that, don't expect miracles. You'll have a hard time getting a good overview shot that's sharp if the lighting is like most conventions.
You could try some creative shots. Get off to the side somewhere with a tripod (slightly above the crowd, if possible) and take a longer exposure shot at low ISO without the flash. The crowd blur will be pronounced, but it might give you a cool effect. Also, try trailing curtain flash, which will allow some ambient light in first (blurring the subject) and then the flash will pop and you'll freeze the subjects close to you.
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