Helpful. Could you poinpoint from where in any of the three theshuvos cited here you draw the following conclusion “Besides, how many of us knew beforehand there is a halachic problem making a Bas Mitzvah ceremony?”
I can see where he states that in a shul it should be forbidden, but a general halachic issue with making a bat mitzvah party? Where does he imply there is something wrong? In fact, he says to make it at home (my addition, like any other birthday party).