I am convinced that one of the most important ways to have a Biblical, God-honoring Christmas is to have a lot of fun. 
Really. Stick with me for while I explain.
On one hand, it is normal (as in “the ‘normal’ tendency to undervalue God”) for Christmas to be all about celebrating: Food, drink, presents, more drinks, and a staggering credit card to show for it.
On the other hand, it is radical (as in the “‘radical” tendency to undervalue this life”) to make Christmas only about Jesus. Am I the only Christian who gets nervous every time I hear someone say “Let’s put Christ back in Christmas”? I worry that “they” won’t be happy until Christmas is nothing but Christ.
In contrast to that, it is radically normal for Christmas to so thoroughly intertwine celebration and Jesus that we don’t know where one ends and the other begins. Nor do we care.
Buried in all of the OT laws about what not to eat and how to deal with mildew in your house are instructions on how to have a great party. For instance:
And Nehemiah, who was the governor, and Ezra the priest and scribe, and the Levites who taught the people said to all the people, “This day is holy to the LORD your God; do not mourn or weep.” For all the people wept as they heard the words of the Law. Then he said to them, “Go your way. Eat the fat and drink sweet wine and send portions to anyone who has nothing ready, for this day is holy to our Lord. And do not be grieved, for the joy of the LORD is your strength.” (Nehemiah 8:9-10 ESV)
“This is holy day,” God says, “so have a great time! Have some prime rib, break out the port!” This theme is repeated again and again: Festival after festival, holy day after holy day, are filled with celebration. We have 10 legal holiday and 4 non-legal ones; Israel had 28. It makes one wonder, why does God command so many parties?
First, who doesn’t want their kids to have fun? The best part of parenting is not making them do their chores or disciplining them. It is when those things are done and we get to play with them or watch them play with each other.
Second, the festivals were designed to associate joy with God. Because joy comes from God, happiness, in its own right, is God-honoring and has the power to draw us to God. This is how I see it: God knows that we cannot fathom the eternal joy of himself, so he gives us earthly joy not as a substitute, but as sample. A good Christmas celebration will be a good sample of joy in God.
Sadly, most people think that God is dull and Satan fun, but a good radically normal Christmas will dispel that notion.
It is a damnable heresy that removes tangible joy from our faith. In our day and age, Satan has led more people astray with this nonsense than better defended doctrines. If people don’t find it in God and his channels, they will go elsewhere.
There is a lot more to be said about this subject (in fact I will be preaching about it on Sunday), but I say all this wish you a truly merry Christmas!