From Wikipedia
In some countries, Teachers’ Days are intended to be special days for the appreciation of teachers. Some of them are holidays while others are celebrated during working days.

In India Guru Divas September 5 It is the birthday of the second President of India, academic philosopher Dr. Sarvapalli Radhakrishnan. It is considered a "celebration" day, where teachers and students report to school as usual but the usual activities and classes are replaced by activities of celebration, thanks and remembrance. At some schools on this day, the responsibility of teaching is taken up by the senior students as an appreciation for their teachers.It is a great day *Sarvapalli Radhakrishnan's Introduction in Hindi