Here are some things to consider with your Online Store for Christmas.  

Are you offering Christmas specials? 

You can put up special Christmas only products that have special pre-Christmas offers.  Gift buyers come in many different types and good quality novelty items sell well at Christmas.

Add Christmas Keywords  
Make sure that you add the Christmas keywords to your meta-keywords with plenty of time to get crawled by the search engines before Christmas. Also make sure that you add Christmas Gift category names and description text to match up with your keywords.  But remember timing is important.  How often does Google crawl your website homepage?  For most online shops it might be every 5-10 days so to get your changed messages out there -  it is not instantly available.  Now might be a good time to set up some web analytics.