One of the main festivals celebrated down south in Tamil Nadu is Saraswathi Pooja/ Vijayadasmi , its the festival to thank goddess saraswathi for the knowledge and wealth you ve been blessed with . It's one day when parents ask their kids not to study as the books are kept for pooja , I loved this day as a kid ;)
All things used in day to day life are given a break from their regular routine , they are cleaned and decorated with flowers , sandal wood paste and kum kum (this is specially done for the vehicles)
