Hi Sankaran,
Yes, As you have mentioned Dasara is one of the biggest festival celebrated in South India.
In Karnataka, Mysore holds a very grand celebration for the Dasara Festival and celebrated with folk dance, cultural activities, events, live concert and many more for the week long.
It is worth to watch the Mysore Palace during this festival. In Banglaore, also Dasara is celebrated very grandly, with events, concerts organized by many event management for Dandiya and other programs for the week long celebrations
Thanks
Nitin