Depending on how religious you are or not, you could go with humor and do the pregnant bride or nun. A belly dancer could be fun too. You could also add equal padding to your back side to match your front and make the whole circle into a pumpkin or a happy face.
I went to a New Year's Eve party 4 days before I delivered, and felt fine. Even wore high heels and did not feel off balance. (They assorted oddly with my ballonlike face, but not many people were looking at my face, thanks to the low neckline of my dress.) You'll probably do great!
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