Aia nui ka palaoa puhi is acceptable.
Ah! SamOhjGon is right. I mispoke. And aia also can be used to place items within a calendar day, such as.
"The party is on Saturday."
Aia ka pa'ina ma ka Po'aono.
Is there some way to make this an "aia" sentence? Can aia be used in an instance (like this sentence) that is stating the existence of something and not a physical location?
No, "aia" is a locational marker.
Why isnʻt ʻheʻ used?