Let me start off by saying that one of the rules for this show was that all tents, tablecloths, chairs etc had to be neutral and of the period (no plastic, no bright colours).
Tip #2: add some bunting, flags, something to the outside of the tent that will move in the breeze and catch the eye of passers-by with the motion.
I had a lot of positive feedback from my booth, as did the show organizer. The extra effort pays off both in sales and for future shows (next year, I get to pick my spot as my booth was highly talked about - how's that for making you feel the effort was worth it). Good luck to you all with your next show.