What can I do at my 16th masquerade birthday party?!

I really want a masquerade party for my 16th next year. I discussed it with my mom and she agreed, but when she asked what do you do at a masquerade, I was stumped. So what exactly do you do at a masquerade? The place that I found, that isn't too expensive, is a beautiful, historic place so I'd want a victorian theme...girls in evening gowns, boys in tuxes. What could I do, I could have contests for the bst dressed, most creative, etc. The place I chose isn't huge, a dance could be possible, but it would be during the day, from about noon-7. I was also thinking about having a "16 candles and roses theme" included in my masquerade theme. Where the girls would have a candle and say a speech and the boys would have a rose and I would dance with them. But I would have to choose 16 boys and girls.
Feel free to add more ideas or comment on what I have suggested.