Movie theaters already do that here in Canada. Though it’s usually rented out to companies to have movie nights for their employees.
But this is usually only offered on weeknights. Weekends they probably won’t do this because they tend to have more ticket sales those days.
So not sure how this would work for a bachelor party. Would you have one on a weekday? And they may not be able to permit people to drink alcohol in most places for legal reasons. They also wouldn’t be able to show whatever people wanted without approval from the copyright holders. Fair use covers you showing your friends whatever movie you have in your collection when you’re at home, but it doesn’t cover a business doing this.