did you know why we celebrate teacher day? No you know we celebrate teacher day because To recognise and celebrate their contributions, Teachers' Day is observed throughout India on September 5 every year. India observes National Teachers' Day to commemorate Dr Sarvepalli Radhakrishnan's birth anniversary, recognising his enormous contributions and accomplishments.Teachers' Day History and Importance: Every year, India celebrates the birth anniversary of Dr Sarvepalli Radhakrishnan (September 5) as National Teachers' Day as a tribute to his contributions and achievements. Radhakrishnan completed his entire education through scholarships.