I find craft fair folks are helpful, polite and respectful...of their neighbor's, other vendors and their customer's.
People are often polite when asked to watch your space while you dash away. You can offer to bring them back a bottle of water for their trouble.
I travel alone a great deal, I've found ways to work around the solo aspects of doing shows.
Plus, I've never had any items stolen when I was away.
And there are NO Silly questions. Sometimes not so friendly responses, or replies that you are not expecting, but never silly questions.
Good Luck with your show season....way to put your self out there!