Navaratri, Tirukkalyanam in Aippasi, (15 October – 15 November) and Arudra Darisanam are some of the important festivals here. Arudra Darisanam attracts huge crowds here. The temple chariot is a massive one, second supposedly only to Tiruvarur. The Bhrammotsavam here lasts for an extended period of time during the Tamil month of Aani (15 June – 15 July).
Also, a golden temple car (First Inaugural run of Nellaiappar Temple Golden Car is 2 November 2009) will run during important festivals like Thirukalyanam, Kaarthigai, Aaruthra Festival etc. During Thaipoosam festival in Thai, Lord Shiva and Parvathy are taken to the banks of Thamirabarani river in Tirunelveli junction called "Thaipoosa mandapam". Special rituals are undertaken there and the Lord return to the temple at night. Nellaiappar Temple car is the third largest car in Tamil Nadu.And it is the first car to be driven fully automatically.

Picture of Tirunelveli Nellaiappar Temple Golden Car taken on 2 November 2009
The temple priests perform the puja (rituals) during festivals and on a daily basis. The temple rituals are performed Six times a day; Thiruvananthal at 5.15 a.m Ushatkalapooja at 6.00a.m Sirukalasanthi at 7.00a.m Kalasanthi at 8:00 a.m., Uchikalam at 12:00 a.m. and Sayarakshai at 6:00 p.m. Arthajamam at 8.30 p.m Palliarai at 9.15 p.m Bhairavar Poojai at 9.30 p.m Each ritual comprises four steps: abhisheka (sacred bath), alangaram (decoration), naivethanam (food offering) and deepa aradanai (waving of lamps) for Nelliappar and Kanthimathi Amman.
There are weekly rituals like somavaram (Monday) and sukravaram (Friday), fortnightly rituals like pradosham, and monthly festivals like amavasai (new moon day), kiruthigai, pournami (full moon day) and sathurthi. The Thai Aaratu festival during the Tamil month of Thai (January - February) is the most important festivals of the temple.

The Gopuram view of Nellaiappar Temple
Tirugnana Sambandar and Appar, the 7th-century Tamil Saivite poet Nayanmars, venerated Nelliappar in ten verses in Tevaram, compiled as the First Tirumurai. Sundarar, an 8th-century nayanmar, also venerated Idaiyatreeswarar in ten verses in Tevaram, compiled as the Fifth Tirumurai. As the temple is revered in Tevaram, it is classified as Paadal Petra Sthalam, one of the 276 temples that find mention in the Saiva canon.Muthuswami Dikshitar composed one song (Sri Kantimatim) on this temple goddess Kanthimathi Amman.This song is considered to be a rare song set in the rare raga Hemavathi.