Teacher's day is celebrated in the memory of Dr. Sarvapalli Radhakrishnan due to his excellence. He had stated his journey as a teacher and had become the President of India. So explain about his life, his works, his ideology etc.
Teachers are not only the ones who teach us school. Even our parents are our teachers. So tell what did you learn from them and how.
Finally tell about your school teacher or any one who teaches you. How they help you in shaping your future and their importance in your life.
And at the end, give the conclusion.