Prime Minister Narendra Modi will on Sunday lead the nation in observing the 12th International Day of Yoga from Red Road in central Kolkata. He will also commission three indigenously designed and built naval ships at the Syama Prasad Mookerjee Port here. Addressing a programme to mark the 'Paschimbanga Divas' of West Bengal Day at Tarakeswar on Saturday, the PM urged the people across the state to organise Yoga Day events and participate actively.