Luckily, the neighbors on my other side hadn't arrived yet. So, I was able to squeeze my car in. I unloaded everything as fast as I could. I unloaded the last box just in the nick of time. My other booth neighbor was just pulling up. I got out of her way so she could squeeze in, just like I did.
Pretty soon the show promoters saw what was happening and came over and spoke to the artist about moving his vehicle. He was nice enough about it, that didn't seem overly concerned that he was hindering his fellow artists.
Yes, I know, it's nice having your vehicle right there when you're setting up or tearing down. Just remember, everyone else is trying to do the same thing.