Upang Lalita Vrat falls on fifth day of Navratri, Shukla Paksha Panchami in Ashwin month. Lalita Tripurasundari Puja is observed on this day. In 2017, Upang Lalita Vrat date is September 25.
On this day during Navratri 2017, Skandamata Navadurga Puja, Lalitha Puja and Bhuvaneshwari Devi Puja are also observed.
Goddess Lalita, also known as Lalitha Tripura Sundari devi and the red Goddess, is one of the most powerful manifestations of Goddess Shakti. Goddess Shakti incarnated as Lalita to demolish the demon called Bhandasura. Bhandasura was a demon formed from the ashes of Manmadha or Kama deva, the God of Love and seduction.
Reciting Lalitha Sahasranama Stotram on this day is highly meritorious..