Weirded out a girl. Fix it or move on?

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I asked a girl, who I liked quite a bit, if is she was going to an event. We know each other and interact often. She said that she was going with her friends. The next day I see her at the event with her friends. I wanted to go up and say hi so I told my friends I would see them later, but it was so crowded I waited alone for people to move out of the way. This was for about twenty minutes or so. When the crowd cleared, I got my courage to go up and tap her on the shoulder to say hi. She had the most disgusted look on her face and was doing the obvious girl thing that girls do to people they want to go away. She went back to talking to her friends and I just left without saying goodbye. As I got back to my friends I eventually realised it was incredibly weird to run into her at the event (which was huge) and then to stand around the general area for so long. Contextually, it was a show so it wasn't too weird for people to be sitting down or standing in a spot for a long time but I was doing it alone and behind her and I also ran into her despite the crown being massive. I must of looked like a major dork or worse a stalker. Now, I accept the fact my chances are finished, but I want to know how bad it was and if I should ever talk to her again, or just ignore her so she knows that I am not a freak.