If it means something to your daughter, and you can afford it, then IMO you should do it.
This might also present an opportunity to network in New York. If you're daughter wishes to pursue music studies, this networking opportunity could be beneficial. Think potential future teachers, masterclasses, schools, etc.
While you are in New York, take in some cultural activities and musical performances.
Years from now, your daughter will remember: the memory of Carnegie Hall, or the memory of being denied the opportunity to go to Carnegie Hall.