Chag HaBanot / Eid al-Banat

I did a search on HebCal and was surprised at the omission of this North African Jewish holiday, which is increasingly observed among Jews globally. Can you please provide a listing and calendar dates for it? So far, what I find online is that it falls on the sixth day of Hanukkah/Rosh Chodesh Tevet. As a holiday that celebrates girls and women, Chag HaBanot is becoming very popular, and also incorporates more Jewish diversity into our calendar. Thank you.