I saw the show over the summer and people were VERY casual. I had on a dress (neither evening nor cocktail). However, I live in the South and things tend to be a bit more casual here. Most people were in jeans.
Remember that many people at the show are not "ballroom" people and don't understand how dressed up we like to be for every event.
I say, wear what makes you comfortable. I would always prefer to be over dressed.