Dan McGarry from Vanuatu's Daily Post newspaper told the ABC he won't be attending.
"The implication here is that anybody who provides negative coverage is going to be treated exactly the same way as the ABC and that is just not on," said McGarry.
"We can't accept that kind of conditionality in our reporting. So for us it is a no brainer it is an obvious decision to make."
The Nauru government is refusing to issue ABCÂ journalists visas because of allegations of interference in its politics, bias and false reporting.
