The Jyeshtha Purnima Vrat is a special day in the Hindu calendar, celebrated on the full moon day of the Jyeshtha month, which falls in May or June. It is a day dedicated to worshipping Lord Vishnu and Goddess Savitri, with married women observing fasts and praying for the well-being of their husbands. The vrat is based on the story of Savitri, who revived her husband Satyavan through her devotion. Celebrations involve fasting, bathing in holy rivers, reading scriptures, and performing charitable deeds.