Hamsanadam Music School, Mandavelipakkam is celebrating its 21st annual day on Nov 20 at P. S. School, Mylapore. Vocalist P. Unnikrishnan is the chief guest. N. V. Subramaniam, managing trustee, Saraswathi Vaggeyakara Trust will preside over the function. At 6 p.m. Ph: 9176197223.