Explanation

World Rabies Day is an international awareness campaign coordinated by the Global Alliance for Rabies Control, a non-profit organization with headquarters in the United States. 

Theme 2020: End Rabbies collaborate vaccine.

Louis Pasteur, French biologist developed the first vaccine for Rabbies.

He died on September 28, 1895 in France.

Therefore, world Rabbies Day is observed on September 28.