Know your audience
Start with age guidance. In the UK the BBFC ratings (U, PG, 12A/12, 15, 18) appear on every release; in the United States the MPA uses G, PG, PG-13 and R. Ratings are a floor, not a verdict: Home Alone and Elf are both PG and suit most primary-age children, while Gremlins and Die Hard belong firmly to the grown-ups' late slot. If you're unsure, the BBFC and Common Sense Media publish detailed content notes for most titles.
Match the runtime to the night
The single most useful planning habit is writing the runtime next to every title. Under thirty minutes: the animated specials. Around ninety: most family comedies. Two hours or more: the musicals and the big black-and-white classics. Put the long ones on weekends and on Christmas Eve, when bedtime bends a little.
Build your watchlist: a 24-night planner
Here is a sample programme for 1 to 24 December, arranged in four weekly "reels" that move from short and gentle to grand and nostalgic. Swap titles freely; the shape is what matters.
Setting up the room
Dim the main lights but keep a lamp or the tree on behind the screen; soft light behind a television reduces eye strain during long films. Turn off motion smoothing if your set offers it, since older films shot on 35mm look far more natural without it. Check the sound before guests sit down, and put subtitles on for mixed-age audiences: younger readers enjoy following along and fast-talking 1940s dialogue becomes easier for everyone.
The snack table and the intermission
Popcorn is non-negotiable, but think about pacing. Serve warm drinks and something savoury at the start, then save a sweet course for an intermission at the halfway mark of anything over two hours. Old roadshow releases had formal intermissions; reviving the idea on Christmas Eve gives children a stretch and adults a refill. Make a small printed "programme" listing the night's short and feature, which children love to hand out.
Screening for a crowd
Showing a film to your family at home is private viewing. Showing it to the public, at a school fair, church hall, community centre or café, generally needs a licence, even if no tickets are sold. In the UK, organisations such as Filmbankmedia and the MPLC issue single-title and umbrella licences for non-theatrical screenings; other countries have similar schemes. Check before you advertise the event.
Keeping the tradition
Write down what you watched and who loved what. Next December, the list becomes a family archive, and you'll notice which film has quietly become your classic, the one you can't skip. That is how traditions are made: not by deciding, but by returning.