Madras Day
Madras Day is held on August 22. Chennai and Tamil Nadu, India. This event in the third decade of the month August is annual. 
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Chennai has the distinction of being the first British settlement. Chennai is the first city in India to have implemented the Conditional Access System for cable television. Chennai was the first Indian city to have a Wi-Fi facility in a widespread manner.
Muthiah, a famed historian, decided that the city deserved a birthday. They chose the founding day of Madras – August 22, 1639 – and made it into an annual event called Madras Day. A sale deed marks the day when Madras, presently Chennai, was actually founded.
Similar holidays and events, festivals and interesting facts
Indian Akshay Urja Day in India on August 20
National Sports Day in India on August 29
Telugu Language Day in India on August 29
Teacher's Day in India on September 5
Hindi Divas on September 14 (Hindi-speaking regions);
Engineer's Day in India on September 15 (The Engineering Community across India is celebrating Engineers Day on 15 September every year as a remarkable tribute to the greatest Indian Engineer Bharat Ratna Mokshagundam Visvesvaraya [popularly known as Sir MV]. He is held in high regard as a pre-eminent engineer of India. "Engineering for A Healthy Planet" is the theme of Engineers Day 2021);
Marathwada Liberation Day on September 17 (Maharashtra, India)