Three high-profile speakers will give talks on Sunday, Auckland's Ken Ring, best- known for his weather and earthquake predictions; investigative journalist and author Nicky Hager; and Massey University environmental science senior lecturer Mike Joy, of Manakau.
Visitors should attend with an open mind and they would leave with a deeper understanding of "why society is in such a pickle", said Hadlum.
Ring will share his controversial views on global warming, climate change and pollution.
Hager specialises in "unseen, untold, and unrecorded" topics on environmental issues, intelligence networks and politics.
"His investigative writings are just as controversial as they are influential."
Mike Joy drew wrath by raising the question of the country's ecological status and comparing facts versus advertising in the 100% Pure New Zealand tourism campaign.