Delhi LG TS Sandhu to launch Yamuna Dialogues on Nov 20, bringing experts and planners together to draft a roadmap for rejuvenating the Yamuna river. New Delhi: Delhi Lieutenant Governor T.S. Sandhu will begin discussions on river rejuvenation at 'Yamuna Dialogues' being organised by the Delhi Development Authority (DDA) on November 20, bringing together stakeholder, including experts from scientific institutions, urban planners and civil society, an official said on Thursday.