Yes, the 'Wailing Widow' and various other ghosts attended the Death-day celebration for Nearly-Headless Nick and traveled from outside the castle.
"Not a bad turnout. The Wailing Widow came all the way up from Kent…
It's nearly time for my speech, I'd better go and warn the orchestra…"
Harry Potter and the Chamber of Secrets
In Chapter Eight of Chamber of Secrets when Nearly Headless Nick invites Harry to his deathday party he says:
Friends will be coming from all over the country.
As these friends are ghosts, there are clearly ghosts all over the country.
This is "I Speak of the Haunted House", which appeared in Tales of Suspense #42, published June, 1963. Story by Stan Lee and art by Steve Ditko.
Two friends make a bet about the existence of ghosts. One bets the other a hundred dollars he will see a ghost if he spends a night at a particular house and the other skeptical one accepts. He enters the house ...
You're describing a segment of the anthology horror film V/H/S from 2012 called The Sick Thing That Happened to Emily When She Was Younger. From Wiki:
This segment is shown through computer video chats. Emily talks to her boyfriend James, a trainee doctor, about a strange bump on her arm and how it reminds her of an accident she had when she was younger. ...
There is also a head throwing team that nearly-headless Nick wanted to participate. We don’t see them around Hogwarts after his deathday party so it’s safe to assume they are outside Hogwarts. I will provide the respective section later
It shouldn't be possible...
We see in Harry Potter and the Chamber of Secrets that, even when the Basilisk stares straight at Nearly-Headless Nick, he doesn't "die" in the sense that your question is asking.
The basilisk kills people by looking at them... Justin must’ve seen the basilisk through Nearly Headless Nick! Nick got the full blast of it, but he ...
おくることば (Okuru Kotoba, Words to Give) by Toshiko Machida
Cover of the 1st volume
They say that a spirit sometimes appears on a certain crossing in town. One day, a high school boy named Sahara gets into an accident on that very crossing, causing him and his friends' lives to change forever.
The description in the question basically describes ...
This isn't really killing or destroying them. But Nearly Headless Nick was petrified by the basilisk.
It was Nearly Headless Nick, no longer pearly-white and transparent, but black and smokey, floating immobile and horizontal, six inches off the floor.
Harry Potter and the Chamber of Secrets, Chapter Eleven (The Dueling Club)
He was completely ...
This would be The Damned (AKA Gallows Hill), which does have the same concept as 'Don't Kill It' but preceded it (it's from 2013).
After a family is involved in an accident, they take refuge in a secluded inn where they free a girl locked in a basement without knowing she's an ancient evil spirit.
It's basically a demon-witch that possesses whoever ...
As noted in some of the comments, this sounds like the 1988 comedy High Spirits.
Peter O'Toole is Peter Plunkett, the owner of a dilapidated Irish castle which has been converted to a bed and breakfast supplying the only employment for the local villagers. Owing money to an Irish-American businessman by the name of Brogan, Plunkett has the ...
The members of the Addams Family were clearly preternatural in their television show incarnation. For example, Morticia was a "smoker"—which did not involve cigarettes, but actually entailed smoke billowing out of her clothing. Uncle Fester could power light bulbs in his mouth. Neither of these things would be possible without magic.