So, i'm going to this formal banquet with this girl and she said that she won't be seen with me if i wear a blue dress shirt there. I told her that that's fine with me an that my sister got me a really nice blue dress shirt and that's what i'm going to be wearing there. She just doesn't like blue and won't wear it becaause of that.
So i told her to wear some other color and that everything goes with blue. She said "no" and then said "have fun there" (she is still going because she already bought her ticket)

How do i handle this situation? I still want to have a date there but she is just being really immature and stupid right now. I will look extremely dumb without her as a date considering that everyone already knows that we are going together. What should i say to her at school and how do i resolve this?

Wear two dress shirts. Put a white one on top, and a blue one on under it. Once you get to the banquet, take off the white one.