The 151st birth anniversary of Sardar Vallabhbhai Patel, popularly known as the Iron Man of India, was observed across Varanasi and neighbouring districts on Friday with tributes, pledges of national unity and public participation. National Unity Day was celebrated across several Madhya Pradesh districts on October 31, marking Sardar Vallabhbhai Patel’s 151st birth anniversary. Unity runs, pledge ceremonies, statue unveiling.