I had my rig set up at CanJam last year and left it. It was hogged by postjack much of the time, so it was safe. It was also set up near people's rigs I know (nate for one), but there were no problems. I think the first international had some hair product issues with a couple high-end cans, and people leaving cables danging to be tripped on or caught up in the chairs.
The way the rooms are set up this year, as far as I know, it should be even more manageable. If I'm not mistaken, your rig will probably be in the high-end room, which will automatically be a bit safer, due to the fact that all the gear will be watched out for pretty carefully. I think John was talking about having volunteers in each room to help out with things, but I don't know if that's actually happening. I wouldn't worry about it. Put a sign with instructions (including no hair products allowed) and enjoy. I'll be glad to watch over your rig for a bit if no one else steps forward.
I was concerned about bringing my R10s because there wouldn't really be a home for them, and I would need people to take care of them, or basically take shifts using them how and where they wanted. If I had a table, I'd do as I suggested above, and go about and enjoy what else was there.