Hosting a New Year's Eve Party at Home

Pick the format first, because headcount drives everything

Every later number (food, ice, glasses, chairs) is multiplied by guests, so settle the format before writing a single list. The three common choices:

• Open house (about 8 pm to 1 am, people come and go): suits 15 to 40 invitees. For a first estimate, plan on about 70% of invitees coming, then switch to confirmed yeses once replies are in. Only about two-thirds of attendees will be in the room at once, which matters for chairs and space, not for food totals.
• Dinner party (6 to 10 people, sit-down around 8 pm): more cooking, but easier to control and the most relaxed midnight.
• Potluck: cheapest for you. Assign categories (dip, dessert, a 10 lb (4.5 kg) bag of ice) instead of saying bring anything, or you end up with five bags of chips.

Send invitations this week with a reply-by date around December 15. A group text or free online invite is fine. Put the start time, the end time or a stay-over offer, and what to bring in the first message.

Scale food and drinks per guest, not by gut feel

• Food: people graze for 4 to 5 hours. Plan 10 to 12 appetizer bites per guest if no dinner is served, 6 to 8 if it is, plus a late-night round around 11 pm (sliders, pizza, a baked dip). The most common failure is planning a cocktail-hour spread that is gone by 10 pm. Put platters out in rounds, and swap out dips, cheese and meat after 2 hours at room temperature.
• Drinks: 2 per drinking guest in the first hour, then 1 per hour. A 5-hour party is about 6 per drinking guest. A 750 ml bottle of wine pours about 5 glasses, and one beer or one cocktail counts as 1 drink. A 750 ml bottle of sparkling wine pours about 6 toasts. Add a jug of water for every 8 guests and keep it filled.
• Ice: 1.5 lb (0.7 kg) per guest, or 2 lb (0.9 kg) for cocktails or a warm-weather party (Australia). Stores often sell out on the afternoon of the 31st. Buy it on the 30th and keep it in the freezer or a closed cooler, or buy it before noon on the day.
• Zero-proof: about 1 in 4 guests drinks little or nothing, especially drivers. Have sparkling cider or non-alcoholic sparkling wine for their toast.

Save effort by buying frozen appetizers, deli or warehouse-club platters, and a dessert tray. Spend your effort on one or two make-ahead dishes you can prep on December 30. Keep the oven free on the night for the late-night round.

Run midnight on a reliable clock

Streaming TV can lag 30 to 60 seconds behind real time, so count down from an official time source such as time.gov in the US or a network-synced phone clock. Keep the TV on for atmosphere. In the UK, streamed and digital feeds of the Big Ben chimes also run a few seconds late, so the phone clock wins there too. From 10 pm, chill the sparkling wine in a bucket or cooler of ice and water, not ice alone, because water chills faster and a cold bottle foams less. Open bottles at 11:45 with a towel over the cork, twisting the bottle rather than the cork and pointing it away from faces. Have filled glasses and noisemakers in every hand by 11:55. Give this job to one helper so you are not hunting for a corkscrew at 11:58.

Plan the ride home before anyone arrives

Rideshare and taxi prices spike and wait times jump between midnight and 2 am. Mention this in the invitation. Offer couch or air-mattress space, and line up sober drivers ahead of time. Switch from alcohol to coffee, water and the late-night food after the toast. You are on track if you finish this session with invitations sent, a shopping list with quantities, and a dated prep timeline.