Planning Food for 20 Guests
Where single batches stop working
Twenty guests is the first size where single-batch cooking breaks down. Most home recipes serve 6 to 8, so every dish now needs a double or triple batch, and oven space becomes the constraint before ingredient cost does. Stagger anything baked: start the first tray before guests arrive rather than trying to run two dishes at temperature at once.
Cold storage is the other pinch point. A packed household fridge will not absorb 20 guests of platters plus drinks, so plan one cooler for beverages and give the fridge to food. If you are ordering out for the main, this is also the size where restaurants want notice: a same-day call usually still works, but a day ahead is safer.
For the general rules behind these numbers (the 1-pound-per-adult baseline, how to mix mains and sides, and when to add a buffer), see Party Food Planning 101 or the serving size chart.