The event will be held in Port Moresby from April 11-17.
Discussions on climate change and the plight of refugees in the Oceania Region will be brought to the table.
Special invited guest is Cardinal Pietro Parolin, Secretary of State from the Vatican, and the representative of the Pope for this assembly.
72 Catholic bishops from Australia, New Zealand, PNG, Solomon Islands, Fiji and 14 other smaller countries of the Pacific are expected to attend this Assembly.