Also, I think it's a great idea to attend a show just to scope it out before attending for real as a vendor. The more homework you do, the better - especially if the show charges you to attend. And I think there's no reason not to be obvious about the fact that you're scoping it out. I'd go as far as to ask the vendors how the show has been going for them - say you are considering it in the future and you'd welcome their feedback. Any non-competing vendors will no doubt talk freely; even competing ones probably will.