Last year at CSS I saw a few 'shimmery' cocktail dresses, but all of the men were in Hawaiian type shirts and khakis or linen style shirt and pants. I'm sure if you wanted to wear a tux that would be fine, although remember even in the evening it is very warm and you will be sweating with any type of jacket on.
At CN & CTI my husband was comfortable wearing nice shorts to the less formal restaurants, but at CSS he felt more appropriately dressed in slacks each evening.
I on the other hand always wear a sundress in the evenings.
Juliann & Jeff
Jamaica Soon Come