Organiser Wayne Wharton says the 30 protesters are preparing for the police operation, and are prepared to be arrested as they continue to occupy indigenous land.
"Basically what people have got to understand, this is not a camp ground - this is a stand - by First Nation's people or embassies right around the country," Mr Wharton told ABC radio.
"Whether (people) like it or not, or Greek Australia, or any other ethnic immigrant that's come to this country, we own this country, we're fighting for our birthright."
On Tuesday, Premier Campbell Newman said it was time for the protesters to move in, and said "squatter's camps" had no place in public parks.
The reference to squatters angered protesters, who said it was insulting and an attempt to manipulate the public into thinking they were "just homeless people and riffraff".
AAP tnf/wjf
-AAP