Ginny was nervous.
She felt that she shouldn't be, because she had known Harry almost her whole life, and there was a point in time where he was one of the people she could totally relax and be herself around, and everything had felt natural and comfortable. Now, it felt like she was going on a first date for the first time, and even though Harry was the same, Ginny had her guard up. She had been hurt now, and instinctively she wanted to protect herself from being hurt again.
But despite all of that, here she was, dressed in Muggle clothing - Ginny opted for jeans and a plain T-shirt, she wanted to blend in as much as possible, even if they were less likely to be recognised in the Muggle world.
It seemed to be working, as she was stood slightly off to the side at the entrance of the stadium, watching the hordes of Muggles entering, keeping an eye out for Harry.