Prime Minister Narendra Modi paid floral tributes to Sardar Vallabhbhai Patel at Patel Chowk on his birth anniversary on Saturday. Union Ministers Rajnath Singh, Venkaiah Naidu, Delhi Chief Minister Arvind Kejriwal and other leaders also paid tributes to Patel. Speaking on the occasion, Modi said Vallabhbhai contributed immensely to India's unity. His ideology and heritage can not be forgotten, the PM said. October 31 is also celebrated as the National Day of Unity.