Vishu is a Hindu festival celebrated by the people of?

Vishu is a Hindu festival celebrated by the people of Kerala, in the Tulu Nadu region of Karnataka, Mahe district of Pondicherry, and some districts in Tamil Nadu. Vishu is celebrated and observed to mark the first day of the Medam, the ninth month according to the Malayalam calendar. Vishu is celebrated in the second week of April and usually falls on the 14th or 15th. This year, Vishu is being celebrated April 15. Vishu is declared a regional holiday in Kerala. It is believed that the Malayalam calendar, which is also known as Kolla Varsham, has been in place since CE 825.