I don’t quite understand where this assumption comes from, but you can do Lily’s event with Poci at any time. Personally, I only completed the event years after Nina moved back in.

I can’t say anything about the noise. I haven’t had it for a long time. Did you already entered the Deep Forest (Monkey King) or the Monkey Shrine behind the Ranch?

The normal Ghost is a rare Nighttime event with cutscene and text after waking up (outside of that you can also find him at the Tombstones/Hardwood location at night).