The party says the money raised will be donated to help in the relief and rehabilitation efforts for Uttarakhand, which was mangled by torrential rains and landslides last month.
The BJP says that while other parties pay people to ensure large audiences for their leaders, Mr Modi is such a large draw that he can amass crowds despite an entry fee.
The party has booked the Lal Bahadur Stadium in Hyderabad for August 11 for its star speaker. The venue can accommodate 30,000 people. The BJP expects a lakh to attend.
The event is being billed as a "youth rally" targeting a demographic of 18-40. Mr Modi addressed students at Pune's famous Fergusson College over the weekend; a few months ago, he addressed Delhi's prestigious Shriram College of Commerce or SRCC where descriptors of the youth like "new-age power" received rave reviews from many students.
He tweeted later: "In our culture every form of life (including puppies) is valued and worshipped." But critics remain unappeased.
On Sunday, at a Pune rally, Mr Modi said the Congress seeks refuge in a "burqa (veil)of secularism" to cover up its many failures. The Congress retaliated today that "the burqa of secularism is much better than naked communalism."
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