Skandamata Puja - day 5(Panchami)
Origin – When Goddess Parvati became the mother of Lord Skanda (also known as Lord Kartikeya), Mata Parvati was known as Goddess Skandamata.
Navratri Worship – Goddess Skandamata is worshipped on the fifth day of Navratri.
Katyayani Puja - day 6(Shasthi)
Origin – To destroy demon Mahishasura, Goddess Parvati took the form of Goddess Katyayani. It was the most violent form of Goddess Parvati. In this form Goddess Parvati is also known as Warrior Goddess.
Navratri Worship – Goddess Katyayani is worshipped on the sixth day of Navratri.