This day is special because the Uthiram nakshatram coincides with the full moon.
This full moon signifies the marriage of Parvati and Parameswara (Lord Shiva), Murugan and Deivanai, and Aandaal (also known as Kothai) and Rangamannar took place.
On Panguni Uthiram, Narayana marries Komalavalli Naachiyar and give his Kalyana Kola Seva to his devotees.
Again, Valmiki’s Ramayana says it is on this day and star that Sita’s marriage with Rama was celebrated.
From Brahmanda Puranam we learn that on Panguni Uthiram every holy water joins Thumburu teertha (also spelt as Tirtha), one of seven sacred tanks in Tirupati Tirumala.
The day is intended to underline the glory of grahasta dharma (or the married life of a householder).
The Almighty manifests in the marital state as Uma Maheswara, Sita Rama, and Radha Krishna – despite his changelessness, sans childhood or youth or old age.
On Panguni Uthiram, in all places where Lord Subrahmanya has a temple, his devotees carry in a kavadi the requisites for puja for him, in fulfilment of vows.
Such vow fulfilment by devotees carrying kavadis is a special feature of Subrahmanya temples wherever they happen to be.
Devotees flock in hundreds to all the Murugan temples during the Panguni Uthiram festival, which is celebrated in March every year.
It is the Jayanti (Day of Incarnation) of Lord Ayyappan.
It is also an important festival day for Lord Subramanya (Muruga), as it is on this day that Sri Deivanai married Lord Muruga.
On this day Goddess Mahalakshmi incarnated on earth from the ocean of milk (after the ocean was churned by the Gods and the demons) and hence it is celebrated as Mahalakshmi Jayanti.
On this day Goddess Parvati in the form of Gowri married Lord Siva in Kanchipuram and hence this day is also celebrated as the Gowri Kalyanam day.
The month of Panguni when coinciding with full moon, sees the festival of Holi too!
A very auspicious day for all Hindus!