National Weeks in December
- National Pet Suffocation Awareness Week (Week After Thanksgiving)
- Clerc-Gallaudet Week (First Full Week)
- National Cookie Cutter Week (First Week)
- National Influenza Week – (First Full Week)
- Older Driver Safety Awareness Week – (First Full Week)
- Crohn’s and Colitis Awareness Week (December 1-7)
- National Hand Washing Awareness Week (First Full Week)
- Halcyon Days: (Always 7 days before and 7 days after the Winter Solstice)
- Computer Science Education Week (Begins the Second Monday)
- Christmas Bird Count Week: December 14-January 5
- Gluten-free Baking Week (Week Before Christmas)
- Las Posadas: December 16-24
- Saturnalia December 17-23
- Twelve Days of Christmas – December 25 – January 5
- Kwanzaa: December 26 – January 1