It commemorates the marriage of the Hindu deities Rama and Sita, as described in the Hindu epic, the Ramayana. The festival typically falls on the fifth day of the waxing moon in the month of Mangsir (November-December) according to the lunar calendar.

During Bibaha Panchami, elaborate processions are held to reenact the marriage ceremony of Lord Rama and Goddess Sita. In Kathmandu, the procession typically starts from Durbar Square and proceeds through various parts of the city, with participants dressed in colorful traditional attire. The main attraction of the procession is a chariot carrying statues of Rama and Sita, adorned with flowers and ornaments.

The festival holds cultural and religious significance for the Newar community, and it is celebrated with great zeal and enthusiasm. Families also have to come together, exchange greetings, and partake in feasts and other festivities.

Bibaha Panchami is an integral part of Nepal's rich cultural heritage and reflects the blending of Hindu traditions with local customs and rituals.