Congratulations on your wedding and Merry Christmas
From the very start you want guests to realize that this is a Christmas wedding that they will remember forever. The invitations are an excellent way to set the tone and to get guests excited about your most festive wedding celebration. Think through how you can incorporate the red and green color scheme and then the elements of the season into everything from the invitations to the decorations. Setting the tone at the beginning and then carrying these cues through to every little detail will really go a long way.
Try to find a venue that has the warm and cozy feel which is perfect for this time of year. Not only does a fireplace go a long way in the cold winter months, but you can find a perfect backdrop for a Christmas wedding. Ask if they will decorate and you may not need to focus as much of your own effort on this if they do. Then you can go for centerpieces that are perfect for the season that incorporate a wreath and some perfectly tied red and green bows. You want guests to feel that Christmas spirit alive and well when they walk into your venue!