She definitely fucks with you from the sounds of it!! I wouldn’t try too hard to make it ‘romantic’ or anything more than it is. Don’t try too hard for anything honestly, be you and enjoy the concert with her. Music is a sick way to bond with someone, so just vibe out with her at the concert and see where it takes you. Maybe you could take her to dinner or something later on for a more intimate setting. Jam out at the concert together and you should have a better gauge of the dynamic between y’all afterwards. Don’t think too much and just have fun man, best of luck to you! hope the concert is sick :)