Panguni Uthiram is an important Tamil festival and it celebrates the wedding of important deities in the Hindu pantheon. The significance of the Panguni Uttiram day is that the Uthiram nakshatra (star) coincides with the Poornima, or Purnima. In 2008, the date of Panguni Uthiram is March 21.
Panguni Uttiram is of great importance in several temples in Tamil Nadu including the
Puranas and epics indicate that the auspicious day of Purnima and Uttiram star coinciding in the month of Panguni (March – April) is the day when most celestial weddings had taken place. It is believed that Lord Shiva married Parvathi on this day. Another legend indicates that Lord Muruga married Devasena on Panguni Uthiram day. It is also believed that Lord Ram married Sita on this day.
Another important wedding that took place on the day is between Andal and Sri Rangamannar (Vishnu). This is known as Panguni Uthira Thirukkalyanam and is an important event in Srivilliputtur and neighboring areas.
Panguni Uthiram is the only one day in the year when we see the Goddess Ranganayaki with Srirangam Lord Ranganatha on the same stage. Lord Vishnu and Goddess Ranganayaki meet in the Panguni Uttara mandapam and this is known as the Panguni Uttaram Serththi (togetherness).
Devotees visiting the various Muruga Temples on the Panguni Uthiram day carry the famous Kavadis and several thousand devotees shave their head during the ten-day festival.
Numerous temples in Tamil Nadu observe festivals during this period.