Which days get the most fake holidays?

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Wednesday is a real national holiday Veterans Day.

But Tuesday was Area Code Day and Thursday will be Fancy Rat and Mouse Day (whatever that means). Nov. 11 is also Origami Day in Japan, a date chosen to commemorate the end of World War I.

Various groups have claimed each of the 365 days of the year for their own special holidays most days have three or more, according to a calendar kept by Days of the Year, a website dedicated to cataloging such days. There are more than 1,200 days listed for 2015.

We will get to experience World Kindness Day, Spicy Guacamole Day, Operating Room Nurse Day, Pickle Day and a dozen others before the week is out.

Here are a few other strange days that have already happened:

  • 55 mph Speed Limit Day (first instituted by President Richard Nixon in response to an OPEC dispute; Jan. 2)
  • I'm Not Going to Take It Anymore Day (Jan. 7)
  • Working Naked Day (the first Friday in February)
  • Laugh and Get Rich Day (Feb. 8)
  • Blame Someone Else Day (the first Friday the 13th each year)
  • World Sword Swallowers' Day (the last Saturday of February)
  • What If Cats and Dogs Had Opposable Thumbs Day (March 3)
  • Snowman Burning Day (March 20)
  • Curmudgeon's Day (Jan. 29)
  • Handcuff Day (Feb. 20)
  • Yellow Pig Day (July 17)
  • Root Canal Appreciation Day (May 11)
  • Walk on Stilts Day (July 27)
  • Be Kind to Lawyers Day (second Tuesday of April)
  • Make Up Your Own Holiday Day (March 26)

Most of these days are ridiculous, but they can also be big business if they take off, they can mean boosted revenues for avocado-growers or pickle-makers or whoever else is having their wares glorified by the day in question (a significant portion of days celebrate a specific food item).

Case in point: Today is also Singles' Day, a once-obscure Chinese holiday for single individuals that has been transformed into one of the world's largest online sales days, bagging about $10 billion in moved merchandise for e-commerce giant Alibaba.

NBC Universal's Universal Pictures recently made $4.8 million after strongly promoting a re-release of its "Back to the Future" trilogy on "Back to the Future Day" in October. And of course, restaurants across the country make unknown amounts of money by planning promotions on popular days like National Taco Day (Oct. 4) and Burger Day (Aug. 27) and Deep Dish Pizza Day (April 5).

But not all days of the year get the same attention for special holidays. In fact, we're in one of the least popular parts of the year for those sorts of days, according to an analysis of Days of the Year data by the Big Crunch.

The average number of holidays on each day drops from around four at the beginning of the year to fewer than three in November and December. Perhaps that's because there are so many real holidays stacked towards the end of the year.

Within a given month, the beginning is the most popular and there are about twice as many special days on the first day of the month compared to the last.

And what about days of the week? The first four days of the week are about equally popular, but special holidays are more likely to fall on a Friday, Saturday or Sunday than any other day (some days are defined as falling on certain days, while others just happen to be on that day for the 2015 calendar).

That could be because it's more convenient for holiday-related festivals, sales and events. After all, who wants to go spend money at a Pickle Day festival on a Tuesday?

So what are we to make of this? Well, if you're looking to start your own day, you may want to shoot for a date without too much competition. You wouldn't want to accidentally overlap with World Nutella Day, or even Extraterrestrial Culture Day (which is an officially acknowledged day in New Mexico).

There are no unclaimed days, but there are 37 days that only have one special holiday listed so far. About half of those are in the last two months of the year, and they probably won't be around for very long.

Disclosure: NBC Universal is the parent company of CNBC and CNBC.com.