Fancy doing something different in December? These five special days will give you an excuse.
December 1 - Eat a Red Apple Day

A Gala apple. Photo by Abhijit Tembhekar.
The first of December is Eat A Red Apple Day. You can celebrate by simply eating a red apple, or maybe making an apple pie. It's also the main fundraising day for research into
young onset bowel cancer, which is a worthy cause if you're in a giving mood.
December 5 - International Volunteer Day

Volunteers sweeping the boardwalk in Brooklyn after Hurricane Sandy. Photo by Jim Henderson.
International Volunteer Day celebrates the efforts of volunteers all over the world in diverse fields like environmentalism, education, health and the arts.
As well as helping others, volunteering can be fun, and may be beneficial to your mental health. You can find volunteer positions through
Volunteering Australia or through organisations local to you like schools and community groups.
Dec 8 - Pretend To Be a Time Traveller Day

Two possible time travellers. Author's own photo, 2020.
Inspired by a
blog post by the creators of Dresden Codak, December 8th is Pretend to Be a Time Traveller Day. If you wish to participate, dress in costume as a time traveller, and spend the entire day in character, without telling anyone that you are a time traveller.
You can choose a costume from any point in the past, or get wild and dress in an outfit from any future you can imagine. This would make an excellent theme for a party! Mad Max style eclectic amour or Elizabethan ruffs, you do you.
December 15 - International Tea Day

Turkish tea. Photo from Wikimedia commons, by user 'henribergius'.
A day to celebrate the second most popular beverage in the world after water. You can observe this day by drinking a cup of tea or sharing a pot with a friend. You could also read about the history of tea, and
Fair Trade tea.
Dec 25 - A'phabet day

'l' in Auslan fingerspelling. Image from user 'Coloringbuddymike', Wikimedia Commons.
In addition to Christmas, December 25th is A'phabet Day, or No 'L' Day. You can observe it by attempting to avoid using the letter 'l' either in writing or speech for the entire day. This sounds like fun to try during family celebrations, and will be especially challenging if you have a family member whose name begins with that letter.
If you know of some other quirky holidays in December, please share them in the comments.