Kailasa was the biggest most popular outdoor band concert organized by St. Thomas' College, Mt. Lavinia was held on 23rd of February 2019 from 6PM onwards at the school premises.

The music mainly focused on the srilankan eastern music culture and also featured fusions of different types of music. Many invited schools showcased their best of their talents. The word Kailasa originates from indian culture as a place where which brought together many cultures and musical formats to bring out the unity in diversity of music.