It's a pretty common art fair. Nothing original. Vendors have wares a bit less in quality than you would see in, say, San Diego or Portland. The drive out from Las Vegas is uneventful. Boulder City itself is kind of a run down old town, littered with dilapidated buildings, biker bars and trailer parks.
The event is for a great cause though, so I would still have to recommend everyone check it out at least once if you have nothing else to do that particular weekend.