We got hundreds of Christmas and Thanksgiving movies. But is there any movies about a family coming together and just having a blast trick or treating and throwing a Halloween party and what not? Without actual monsters and ghouls showing up. Like a Hallmark movie but Halloween? A Halloween romcom? Two dorks who love spooky season falling in love. I swear this doesn't exist.
shareFun Size starring Victoria Justice maybe?
https://www.imdb.com/title/tt1663143/?ref_=nv_sr_1?ref_=nv_sr_1
Trick 'r treat, 2007
Meet me in St. Louis, 1944
Monster House, 2006
Tails of Halloween, 2015
Boo! A Madea Halloween, 2016
Boo 2! A Madea Halloween, 2017
Night of the Demons 1988 and 2009
Holidays (2016)
The Terror of Hallow's Eve (2017)
Arsenic and Old Lace (1944)
Trick or Treat (1986)
Boo! (II) (2018)
Halloween at Aunt Ethel's (2019)
All Hallows' Eve (2016)
Trico Tri Happy Halloween (2018)
10/31 (2017)
Ghost Squad (2015)
Monster Mash: The Movie (1995)
Caesar and Otto's Paranormal Halloween, 2015
Halloween Party (II) (2012)
I don't think Night of the Demons fits the OP qualifications of no actual ghosts or monsters showing up. But kick ass classic 80's horror movie nonetheless.
shareIt's not a Halloween movie, but It's The Great Pumpkin, Charlie Brown was always one of my favorites.
shareHocus Pocus https://www.imdb.com/title/tt0107120/
Nightmare Before Christmas https://www.imdb.com/title/tt0107688/
The Witches https://www.imdb.com/title/tt0100944/
(The Witches is not set in Halloween, but in a Witch convention... that looks a lot like Halloween).
And, while it's not Halloween related, Hong Kong 70s/80s has very fun family horror movies:
Mr. Vampire https://www.imdb.com/title/tt0089371/ (and the rest of the saga)
Encounters of the Spooky Kind https://www.imdb.com/title/tt0080827/
And going spooky romcom:
A Chinese Ghost Story https://www.imdb.com/title/tt0093978/
The Enchanting Ghost https://www.imdb.com/title/tt0453091/ (This one is a personal favorite)
The Bride with White Hair https://www.imdb.com/title/tt0106342/