“Ashkenaz Rabbonim have not instituted any sort of “simchas bat” and therefor it is not part of our mesorah”
Just curious. Did they institute the concept of making a kiddush in shul to celebrate the birth of a daughter? Celebrating an engagement with a “vort”? Chulent thursday nights? Late minyanim for shachris during bein hazmanim? These are all part of the Ashkenazic “mesorah”. I think what is most important is that someone who wants to make a “simchat bat” or whatever it is you want to call such a gathering, that it be done in a way that if they invite their Rav he would have no problems with any of the proceedings.