As this post says:
As the holiday season approaches, we look forward to the joy of family gatherings, shared meals, and celebrations. Whether you celebrate with presents under the tree, wooden shoes stuffed with straw, or a bonfire made from dried thorn branches, it is a season of joy and togetherness.
The Christmas season is an opportune time for breaking down barriers and for connecting with those who lighten our lives or whose lives we can make lighter through helpful service. Whether driven by personal convictions of faith or love for mankind, we choose to light the world.The post suggests four weeks of activities during the month of December. I suggest a few more.
Take the time to record an oral history of one of your older relatives. From my own personal experience, recording oral histories can be a life-changing experience for you and for the person whose memories you preserve.
Join a genealogical or historical society. No matter where you are in the world, there is likely a genealogy or historical society nearby. I have belonged to several such organizations and still do to some, and found that the association with others with similar interests is beneficial to both you and the society.
Upload some photos, documents, or stories to the FamilySearch.org website or another great sharing website such as MyHeritage.com.
Write your own personal history and share it with family members.
Volunteer to teach a genealogy class at a local library, care center, or other community organization.
You can probably think of a few more ways to Light the World through genealogy and family history.