The Deseret News (SLC, UT) provided a "classroom connections" page 12/3/08 listing "December Days to Remember"events--many of which are/were geography based. Sharing a few of the dates/events mentioned in the article:

Dec 1: Rosa Park;s Day. Anniversary commemorating when Rosa Parks was arrested for refusing to give up her seat on a bus in Montgomery, Alabama.

Dec 2: Barney Clark receives world's first artificial heart transplant,
SLC Utah.

Dec 7: Thomas Edison exhibited phonograph, Menlo Park, New Jersey.

Dec. 7: Pearl Harbor, Hawaii, attacked by Japanese drawing U.S. into WWII

Dec 8: John Lennon killed in NYCity, New York

Dec 10: Wyoming, (US territory) allowed women to vote and hold office 1869

Dec 15: "Gone with the Wind" 1939 premierd in Atlanta GA

Dec 16: Boston Tea Party, 1773 Boston Harbor, Massachusetts

Dec 16: Battle of the Bulge 1944 A major German offensive launched towards the end of World War II through the forested Ardennes Mountains region of Belgium, France and Luxembourg on the Western Front.

Dec 17: Wright Brothers' Day celebrates the first successful airplane flight @ Kitty Hawk, NC

Dec 21: Winter Solstice: Shortest day and longest night of the year. Sun appears at the lowest point in the sky.

Dec 21:Pilgrims first set foot on American soil at Plymouth, Mass 1620

Dec 21: Hannukkah is celebrated from Dec 12-29 to show praise and honor to God for providing 8 days of oil (from a single day's worth) in the Temple of Jerusalem.

Dec 23: Aircraft, Voyager, completed first round-the-world flight without stopping or refueling in 1986.

Dec 25: Christmas is the Christian celebration of Jesus' birth. Millions of believers (& non-believers) commemorate the day with feasts and gifts.

Dec 25: William the Conquerer is crowned King of England 1066

Dec 26: Kwanzaa African American celebration (12-26-1/1) to reconnect with Adrican traditions and principals such as unity, self-determination, creativity, and faith.

Dec 27: Edwin Hubble announces the existence of other galactic systems
1924