Reason: Generally, the Divine Wedding of Skanda-Devasena (Thirukalyanam) is celebrated on Panguni Uthiram day However, since the Lord married Devasena after war victory, Thirukalyanam forms a major part of Skanda Shashti festival Skanda is also depicted as Devasenapathi in one of the temple wall sculptures Sri Devasenapathi Moorthy (Please refer to my article on Devasenapathi Moorthy: ) Rituals: In the early morning of 7th day (day after Soorasamharam), Sri Devasena arrives at Tapas Mandapa to perform penance Sri Jayanthinathar* graces Her in the evening, after which garland exchange , special poojas are performed This is followed by betrothal ceremony Sri Jayanthinathar, Sri Devasena - Tiruchendur Betrothal ceremony At night, Thirukalyanam takes place followed by Oonjal (swing) ceremony & Veedhi Ula (procession) Sri Kumaravidanga Peruman, Sri Devasena - procession : *(One of Lord Muruga's names, meaning Lord of Victory)