ayid:
Yes, I purposely blurred the lines. That was my point. Not every action has a mesorah attached to it. What it should have, as alluded to in my last sentence is that it be done according to halacha. For me, it means following my Rav and his psak, for you it means following your Rav and his psak and for the makers of the Simchat Bat mentioned by the OP, it means following the psak of her Rav.
I agree that not every action has a mesorah attached to it, but I think that this is restricted to things like eating milichigs or fleishigs on a Wednsday night. Not creating religion inspired rituals.
But again, I am not saying what they did was wrong from a halachic perspective. But I think it is an expression of something fundamentally wrong with the person’s relationship to Judaism. On the other hand, if this was done wit the hamlataza of their Rabbi, then maybe the problem is not with the parents alone…