Hundreds of participants joined Run for Unity events across India on October 31 to mark Rashtriya Ekta Diwas and Sardar Vallabhbhai Patel. New Delhi: Hundreds of participants took part in 'Run for Unity' marathons organised across the country on Saturday to mark Rashtriya Ekta Diwas (National Unity Day) and the 151st birth anniversary of Sardar Vallabhbhai Patel, with Chief Ministers of various states flagging off events in several states.