No need to wait until the 31st to start celebrating. October is full of party hat-worthy holidays. 

1. OCTOBER 2: NATIONAL CUSTODIAL WORKERS DAY

Because really, we should be celebrating them every day.  

2. OCTOBER 4: TEN-FOUR DAY

The fourth day of the 10th month of the year is the day the world celebrates radio operators, to which we say, “Ten-Four.”

3. OCTOBER 8: NATIONAL PIEROGI DAY

On this day in 1952, pierogies were first delivered to a grocery store in Shenandoah, Pa., and we’ve been devouring them ever since.

4. OCTOBER 10: NATIONAL HANDBAG DAY

We carry them around, but in many ways, it’s the handbags that carry us.

5. OCTOBER 12: INTERNATIONAL MOMENT OF FRUSTRATION SCREAM DAY

To celebrate this organized catharsis, go outdoors at 12:00 Greenwich Mean Time (8:00 a.m. EST) and scream for 30 seconds.

6. OCTOBER 13: NATIONAL FACE YOUR FEARS DAY

The spookiest month of the year is as good a time as any.

7. OCTOBER 14: NATIONAL BRING YOUR TEDDY BEAR TO WORK DAY

Because not everyone has a child or pet to show off.

8. OCTOBER 15: NATIONAL GROUCH DAY

For those who love one, and those who are one.

9. OCTOBER 16: DICTIONARY DAY

It’s Noah Webster’s birthday, so take a break from your lackadaisical use of the English language, k?

10. OCTOBER 19: EVALUATE YOUR LIFE DAY

It’s time.

11. OCTOBER 22: SMART IS COOL DAY

This is one that mental_floss HQ can really get behind.

12. OCTOBER 23: NATIONAL MOLE DAY

Neither a tribute to the animal, nor a skin feature, nor an undercover spy, Mole Day honors Avogadro's Number, which is a basic measuring unit in chemistry.

13. OCTOBER 26: NATIONAL MULE DAY

Now that you’ve celebrated “moles,” give a tip of the hat to mules—literal ones this time. On October 26, 1785, a pair of Spanish mules arrived in the U.S. as a gift from King Charles III. They’re said to have been the first mules bred in this country, by George Washington himself.

14. OCTOBER 27: CRANKY COWORKERS DAY

Not that you have any of those ...

15. OCTOBER 29: NATIONAL CAT DAY

Staff writer Shaunacy Ferro's cat Ferguson.

We know you don’t need a date in the calendar for this, but it makes your Instagrams all that much more justified.

16. OCTOBER 30: NATIONAL CANDY CORN DAY

Feel free to debate the merits of a holiday for this highly controversial, tricolored confection.

17. OCTOBER 31: NATIONAL MAGIC DAY

Halloween, shmalloween. This holiday is fittingly held on the anniversary of the death of Harry Houdini.

All photos courtesy of iStock unless otherwise noted.