Hollywood actor Leonardo DiCaprio and Virgin Group founder Richard Branson are expected to attend an event to be organised in London on July 29-31 to commemorate the centenary of the Hindu Swayamsevak Sangh, which will also see the presence of Rashtriya Swayamsewak Sangh (RSS) chief Mohan Bhagwat and RSS all-India joint secretary Dattatreya Hosabale.

The event is being organised jointly by the Maharishi Mahesh Yogi organisation and the Vishwa Hindu Parishad, with Bhagwat expected to be the chief guest on July 31, according to a report in the Daily O, which states naturalist David Attenborough will also be a part of the event.

DiCaprio and Bhagwat, who both are vegans, are expected to deliver chip in with "anti-beef" messages. There were reports last year that Branson planned to launch a vegan airline, but then there were also reasons to be sceptical of the news, given that it came on April 1.

DiCaprio is the executive-producer of a 2015 cut of the 2014 documentary "Cowspiracy," which claims to follow "filmmaker Kip Andersen as he uncovers the most destructive industry facing the planet today â€“ and investigates why the world's leading environmental organizations are too afraid to talk about it."

Bhagwat is also expected to hold an interfaith dialogue with Justin Welby, the archbishop of Canterbury, the Daily O report said. He is also slated to pay a visit to Ambedkar House, a residence the architect of the Indian Constitution had called his home in 1921-22. India acquired the Ambedkar House in September last year, and Prime Minister Narendra Modi inaugurated a memorial at the building on Nov.14, 2015, which is the birthday of both Ambedkar and India's first prime minister Jawaharlal Nehru.

According to the Daily O report, Bhagwat will also look to emulate Modi's record-breaking address at Madison Square Garden in the U.S. There will reportedly be a large gathering of NRIs at the London event on July 31, which will culminate in an address by the the RSS chief.