Does Lubavitch have an agenda to convert everyone to their derech?
If they do, I'm assuming the best way to do that is by making a concert and telling stories?
Unfortunately there are elements of this mentality in every Orthodox group, Chabad as well.
I think Chabad works to promote our “values” (in not finding the right word), to spread Chassidus, both the study and the experience. The concert goes into that category.
Don’t shoot the messenger, I’m not advocating for or defending any of this, just trying to answer the question.