There's at least one more Windenberg party location, I think the Chateau, or maybe the Ruins, maybe both, that a party at the Eternal Hollow cemetery in Ravenwood is said to be at. I have never seen a crazy party event say it is happening at the cemetery, it's always at one of the Windenberg event location types, then specify it is at the Eternal Hollow cemetery, so I suspect the string "I got the scoop that some crazy party is happening at the cemetery right now! Wanna check it out?" was never added, or perhaps incorrectly referenced.
I'm having the same problem and I'm in trouble. I've attached a screenshot, sorry it's in Japanese. I'm a PS5 player.
