For the noise maybe you could have them do the demo on a timed basis, like for 15 minutes every hour on the hour. that way its not a constant distraction. set it up at the opposite end from the presentations.
15 minutes of turning and sanding, a 15 minute demo on Through-wiring and Hardware placement, then a Q&A session followed by some time for selling your goods and/or a break for the guy working the booth.
that way the actual noise is on a limited basis
I would love to see something like this
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