Simon Richards, director of The Freedom Association, said he was also being assisted by leading activists from Australia and Italy.
"Lots of people feel left out by politics at the moment," Mr Richards said. "It's not just taxes – they feel overwhelmed by the sheer scale of government."
Mr Richards said he hoped David Davis, the former shadow home secretary, would speak at the Tory conference event.
The backing of Mr Davis, who was beaten to the party leadership by David Cameron in 2005, would sharpen opposition to the Coalition's plans from the Tory Right. Mr Davis last night said he may not have time to take part.