It is not easy to give a Carnatic Music concert. One has to learn it for years with a guru or several gurus. Singing a kacheri in the park or roadeside will not increase the number of listners of this branch of music. One need to to spend time and enery to understand it.
Going to public and bringing to public are good and befitting to some kind of issues not for Carnatic Music and artforms like Kathakali etc. Having said that, these typs of acrobatics viz singing in a park and roadside will give a 15 minutes fame for the contestants and organizers, that too if they are lucky enough.