Halloween IV takes place during the same time as The Golden Girls.
The Golden Girls, S4E45, “The Visit of Michael Myers”
Sophia wants to celebrate Halloween (“an American tradition we didn’t have in Sicily”), and so the girls go to see Halloween (1978) at the movies just a few days before Halloween night. Over the next few days, Rose slowly convinces Blanche that Michael Myers might escape and eliminate anyone who knows his story. In a frenzied panic, Rose and Blanche mount an armed defense using Big Daddy’s old shotgun. They almost shoot Dorothy, who comes home late after working with a tutoring group afterschool. She tells them that there is no such person as Michael Myers and that they might’ve killed someone with that shotgun of theirs. Blanche puts the gun away and the girls start to have a good laugh.
Suddenly, the lights go out. A shadow looms up on the wall—Michael Myers and his knife. He slowly turns and raises his knife on Dorothy, and all three girls shout and run and lock themselves in Blanche’s bedroom. Then they hear a laugh, and a familiar voice calls out, “You all woulda never lasted a minute in Sicily!”