‘Chaturmasya Vidiya’ or ‘Chatumas Dwitiya’ is observed on Kartik Krishna Vidiya as per Andhra Pradesh, Karnataka, Maharashtra and Gujarat Calendars.
In 2020, Chaturmas Dwitiya dates are August 5 and December 2.
On Chaturmas Vidiya, Ashoonya Shayana vratam is concluded. Ashoonya Sayan vrat starts on Shravan Krishna Vidiya and continued for four holy months.
Though, Chaturmasya Vidiya is a least known festival but Vishnu Puja on this day is recommended for great merits. Some devotees continue their Chaturmas vrata (observance of four holy months) until Chaturmas Vidiya.