If you love the idea of an intimate small Christmas party, a group of 10–20 people allows close interaction. Medium-sized parties with 20–50 guests offer a personal but livelier and louder atmosphere. Larger parties with 50+ guests can be too much if you are planning a family Christmas party as it may require more space and planning. But it’s totally up to you and party preferences.  Consider the venue’s capacity and your desired ambiance when deciding on the size.