Yes, it would be helpful if you had extra vices to bring. I have a setup (an idea that I hope works out) that I'm bringing with two vices on it. I will also bring my tillering tree/scale and some tools. Be certain to label your rasps, scrapers, etc with your names as they can get mixed amongst each other. Likely, they will.
I'm hoping also to add a novelty shoot to the event. I spoke with Mike Damon, and he likes the idea. If you can save and bring empty gallon milk jugs, all you can bring will be needed for the novelty event.
Matt