After re-reading your post I see you said you aren't comfortable in dresses. A pair of nice dressy black pants and a beaded evening top would work well too. Just make sure the shoes and bag are the type you would wear with a cocktail dress. If you aren't comfortable styling your own hair and can get an appointment with your stylist I would do that. Your stylist should be able to suggest a great hairstyle for what you'll be wearing. Have fun!
ps- don't worry too much about over dressing- it's very hard to do in West Palm.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226