Prakash Mandal, the Bajrang Dal's convenor for Naryanpur block, was arrested on charges of hurting religious sentiments.
The Bajrang Dal claimed on Sunday that no firearms training was given during a camp held by it at a school in Thane district last week.
When contacted, Sandeep Bhagat, Konkan region coordinator of the Bajrang Dal, said the allegation was a "political conspiracy".
A total of 38 people, including local BJP and Bajrang Dal leaders, were arrested for the violence that broke out in Siyana tehsil of Bulandshahr on December 3.
In a related incident, a young couple was allegedly forced to tie the knot at a public park in Medchal area, by a group of people.
The activists went on to film the entire episode while the boy tied around the girl's neck a pasupu thadu, a thread smeared with turmeric which is used in marriages as a mangalsutra.
Social activist Vidya Dinker said it is an open secret that ‘special arrangements’ are made to ensure that the day is celebrated within pubs.
The right-wing body also issued notices to 28 schools and colleges demanding that students be prevented from observing the day.
The members urged police to close down parks while asking ‘lovers’ to refrain from ‘vulgar’ activities.
One of the prime accused in the case, BJP's Yuva Morcha leader Shikhar Agarwal was on January 10 arrested by the police from Hapur.
Raj, a leader of the Hindutva outfit, was arrested on January 3 for his alleged role in the mob violence that killed a police officer and a local.
The news of the recovery of cow remains spread like a wildfire in the area resulting in a huge build-up of villagers at the spot.
Bulandshahr violence: Villagers dispute four names in cow slaughter FIR, complaint filed by main accused from Bajrang Dal
The FIR is based on a complaint filed by Bajrang Dal's district convenor Yogesh Raj, the main accused in the violence that broke out Monday after cow carcasses were found strewn in a jungle.
Members of Hindu groups gathered on the Bulandshahr-Syana road and resorted to stone-pelting at the police personnel with a cow carcass.
The former Bajrang Dal leader has claimed in his plea that the high court order convicting him merely on an alleged extra-judicial confession was "erroneous".