I second all the "classy black dress" suggestions. This is a good time to make an investment in this wardrobe staple. You will get lots of use out of it - this type of dress can be worn again and again, with lots of different looks by changing accessories.
For the love of life, DO NOT be one of those girls who shows up in some overpriced trendy dress in some outrageously bright color. It's a classy event so look classy.
Basically, if Carrie Bradshaw would wear it, Just Say No!
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