So I have tickets to the Tony Awards in June. It's my first time and I'm not sure what to wear. I know it's a black tie event, but would I be ok with wearing a prom dress. Here are pictures of the two I have. Would one be better than the other, or should I get a new dress entirelly.

This is from this year
http://i44.photobucket.com/albums/f34/blondegenius2272/70.jpg

This is from last year
http://i44.photobucket.com/albums/f34/blondegenius2272/n1091370168_300 22102_3552.jpg

Thanks!