Candy was a huge hit at my booth! And there was a minister who's booth was next to mine who had never done a show before and didn't bring anything to "dress up" her booth. So I lent her my spare bowl and some candy and she remembered me for that! Got a wedding out of the deal.
Candy is ALWAYS a good idea!! Plus some people bring their kids.
As for the booth, your setup sounds similar to the one I did in October. I used wooden tripods I purchased from Michaels ($20 each) that I painted black. I put two large canvases on those and they flanked my table. Then I had a 42" LCD TV that I ran a slideshow on. I put some chairs in front of the sideshow and would get a few people sitting or standing around watching it for pretty much the whole loop (I used 50 images). Then I had a 15x30 over the TV and some 24"+ matted photos "floating" around that. For that I used black string that I looped around the piping and then into the corners of the images. Not the greatest way for the longevity of these images, but I switch my images out and trash the old ones every season so longevity isn't an issue for me.
The thing I personally can't stand is when people create a whole TV set out of their booth... with vintage trunks and chain link fences, but then show only a few 8x10 images and an album. I feel like, as a bride, I'd want to see BIG pictures, not a scene of some sort. They want to get works of art when they hire their photog. Not some tiny 8x10s where you can't even really see the detail! At any given time I'll have 2 large canvases and 5+ enlarged matted images plus the 50 or so on the TV. I want to show clients that I can consistently produce images that can be blown up and displayed.