Pearl Harbor which brought the U.S. into WWII. While this list is definitely last-minute for this year, you might bookmark a few of these resources for next year or later in the year when you get to WWII in your curriculum (I typically covered WWII in April in my curriculum).
National Geographic has a good resource students can explore to learn about the attack on Pearl Harbor. The Interactive Pearl Harbor Attack Map
is a map and timeline accompanied by voice narration. Each stop along
the timeline of the attack is accompanied by a short narrated passage.
At each stop students can click on the map to read more information
about that place and moment in the chronology of the attack.
My Story: Pearl Harbor is an hour-by-hour account of the attack on Pearl Harbor. The account is told from the perspective of Dale and Johnie Gano who were stationed at Pearl Harbor.
The National Parks Service offers lesson plans about Pearl Harbor and the USS Arizona.
Here is a video clip of President Roosevelt giving his "Day of Infamy" speech.
SnagFilms hosts Pearl Harbor: Day of Infamy. This documentary includes interviews with 25 people who witnessed the attack on Pearl Harbor.