Which dress should I wear?

I'm going to a party tomorrow. It's the kind of party where you are supposed to dress a bit more formal than you do to a normal party.
And then I have my speech day June 10th, and I'm going to wear one of these dresses on that day too.

Here are the precious things.. :


I'm going to wear one of them tomorrow and the other one June 10th.
I can't make up my mind though.

What do you think?
Dress 1 or dress 2?