Yes, it is a Tamil country's important festival.
The Sun itself stands for all the ideals of the Pongal festival. Its message is that of light, unity, equality and true selflessness. These are the ideals of Karma Yoga. Hence, the sun is the greatest Karma Yogi.
The Sun is not merely a huge orb of atomic energy as the physicists would tell us, but a radiant mass of life-giving vitality to everyone. And it is this Surya that is worshipped on Pongal.