Call for Artists, Making Money at Juried Art Fairs, Craft Shows and Festivals
I have recently moved to TN so I don't do shows in the northeast anymore but when I did Artrider had a good system. As soon as anyone noticed something missing or saw someone that looked suspicious, you'd immediately report it to the promoters who would then announce over loudspeaker "Artists BE ATTENTIVE TO YOUR BOOTH" several times. We artists understood what it meant and hopefully the thieves got the hint that we all know they are there. That worked for shows where the speaker system could be heard almost everywhere.