Of course there are a number of holidays this month. Please don't neglect to put up a winter/snow sort of display to balance things out for those who don't celebrate Christmas. There are a number of romance and horror titles which focus on winter and snow. Mysteries, particularly those by Scandinavian authors (Scandi Noir) are also good options if you are looking for fiction. Consider knitting, winter decor, and travel narratives from wintery places. There are plenty of wintery DVDs which could be added as well.
Beyond Christmas, Hanukkah, and Kwanza, there is Yule and Winter Solstice to consider. Set up displays of paranormal romance, occult horror, urban fantasy, and non-fiction books about wicca, the occult, and related subjects.
In 1997, the show Seinfeld introduced Festivus to everyone. Do you have books that are based around complaints? Titles that you think various Seinfeld characters would love? Use your imagination and even set up a Festivus pole!
December 1 is celebrated as Rosa Parks Day. It commemorates the day in 1955 when Rosa Parks refused to give up her seat on a Montgomery, Alabama bus and the Montgomery Bus Boycott followed. It's always good to add a display about Black History outside of February. Beyond non-fiction titles about the history of the US Civil Rights Movement and books about antiracism, think about looking for novels and DVDs that take place during the era as well as biographies of prominent civil rights leaders.
On December 3, the United Nations has established the International Day of Persons with Disabilities to promote the rights of people with disabilities. It's a good time to check your collection for titles that cover disability rights and issues of concern to those with disabilities. Your adult fiction collection and youth fiction collection should also include titles that feature people with disabilities.
National Pearl Harbor Remembrance Day is December 7. 2,403 service members and civilians died after the Japanese attacked Pearl Harbor. Don't forget DVDs and youth titles about the event. You can expand the display to include World War II books or books about Hawaii in general if you need to fill it in.
Best of lists appear all month. They are a good way to promote your eBook collection by demonstrating to your patrons that they can get eBooks and eAudiobooks as a service from their library. Becky Spratford of RA for All summarizes the best of lists on her blog. You can also set up physical displays of the titles you have available although I would suggest using the backlist of any of the authors on the list or readalikes and including a QR code linking to your digital collection instead.