On occasion of 6 December 2013 - the Hindu Far Right Rashtravadi Shiv Sena were as celebrating victory day (the day of destruction of Babari Mosque demolished by hindutva activists in Dec 1992) at Jantar Mantar.
See low res photos below
Participation of some 50-6à people with headbands. Very loud, provocative and threatening speeches (clear incitement to violence), lasting a few hours --from mid day to early afternoon-- followed by a march with saffron flags across Jantar mantar. Very well organised with their on back up generator set and an eletric cart to carry their wares at the end of the event.
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Later around 4 or 4.30pm the Muslim Far Right Popular Front of India had an open air (i.e. no tent on top) event at Jantar Mantar estimated participation of say 80 or 90 people. Loud and charged speeches. There was bus parked further down that that brought the crowd. See low res photos: