National Parfait Day 
In French, the word parfait means “perfect”, and in American English, the term almost exclusively refers to a sort of delicious, frozen dessert. If your idea of perfection involves ice cream, then you’ll have little trouble understanding the connection with the name. And why not have a day devoted to creamy, delicious indulgence? Shouldn’t there be at least one day of the year where you can indulge in something so rich and celebrate rather than feeling guilty about it?
https://www.daysoftheyear.com/days/parfait-day/
Flossing Day 
has been celebrated since the year 2000, to remind people of the importance of looking after their teeth. Flossing is an important component of this, and dental floss has been available since the late 1890s. Ironically enough, when Johnson and Johnson developed the first patented dental floss in 1898, toothbrushes were still quite expensive. Originally, floss was made from thin silk threads, but by the end of WWII nylon had become prevalent. While it did take 102 years to come up with such a day as Flossing Day, you shouldn’t really overlook your oral hygiene for that long. If you did, you’d lose all of your teeth long before that.
https://www.daysoftheyear.com/days/flossing-day/
Buy Nothing Day 
was founded in Vancouver, Canada by artist Ted Dave in September of 1992. It is celebrated on the Friday after American Thanksgiving (the day also infamously known as ‘Black Friday’). And anyone who has ever seen what happens in North America during the Black Friday sales understands all too well why it was high time that we take a step back and look at ourselves, our behavior, and contemplate the meaning of all of the Black Friday madness. Soon after Buy Nothing Day was created, campaigns to have a similar day of reflection started appearing in the United States, the United Kingdom, Israel, Austria, Germany, New Zealand, Japan, the Netherlands, France, and Norway. More than 65 nations currently participate in it. Adbusters, a company responsible for the inital promotion of Ted Dave’s idea for Buy Nothing Day, states that the day “isn’t just about changing your habits for one day” but “about starting a lasting lifestyle commitment to consuming less and producing less waste.”
https://www.daysoftheyear.com/days/buy-nothing-day/
Shopping Reminder Day 
Shopping Reminder Day falls roughly a month before Christmas, and as such it’s the perfect reminder to go ahead and get started on all of your holiday shopping. Yup, that’s right, there’s a day to tell you to shop so that you don’t go and procrastinate on all of your holiday shopping right up until Christmas Eve (like my dad always did, but I don’t think he’s alone at all on this front). But in all of the commotion of promotions, sales, and Christmas shopping, maybe you forgot something important. You’ve been running around like mad – is there anything in your refrigerator? Or maybe you need to buy some things for the house? See, maybe it is a good thing that there’s such a thing as Shopping Reminder Day even at this time of year.
https://www.daysoftheyear.com/days/shopping-reminder-day/
http://www.famousbirthdays.com/november25.html