13 August 2021 is Nag Panchami, Nagula Panchami, Nagara Panchami. It is a day which is auspicious for Naga Puja, worship of Serpent Gods & Goddesses. Garuda Panchami is also observed today. It falls on Shukla Paksha Panchami in Shravan month.
On Naga Panchami day, Kalki Jayanti (first appearance day of Kalki Avatar of Lord Vishnu) is also celebrated.
13 August 2021 is also observed as: Shravan Somvar Vrat (Shiva Pujan). Rig Shukla Yajur Shravani. Shiva Muth (Tandool) in Goa. Rotak Vrata aramabh. Someshwar Pujan. Nag Darshan Pujan. Takshak Pujan. Jagruth Gauri Panchami. Gudiya Parva. Mahakal Ki Savari in Ujjain Mahakaleshwar Temple..