Where the World Gathers to Celebrate Every Day




Each year on April 21st, National Kindergarten Day honors the birthday of the man who started the first Kindergarten. Friedrich Wilhelm August Frobel (April 21, 1782  – June 21, 1852) is credited with starting the very first Kindergarten in Germany in 1837. Frobel was a German teacher and a student of Johann Pestalozzi. Frobel laid a foundation for modern education, recognizing that children learn through play and experience.

The first kindergarten (which means garden for the children) was developed in Blankenburg, Germany, in 1837. The kindergarten fostered Frobel’s social experience for children, which would allow them to transition from home to school more smoothly.

Eventually, the Prussian government banned Frobel’s unorthodox methods. However, the rest of the world was eager to accept Frobel’s idea of kindergarten, including the United States.

In 1856, Watertown, Wisconsin, opened the first kindergarten in the United States. Founded by Margarethe Schurz, this kindergarten was a German-language class, as were many in this region. Kindergarten found its way into private English speaking institutions across the country, but it wasn’t until 1873 that it became part of any public school system.

HOW TO OBSERVE #NationalKindergartenDay

Say thank you to a kindergarten teacher in your area. If an elementary education career is a potential career choice, consider being a kindergarten teacher. Learn more about elementary education. If you’re a kindergarten teacher, share your experiences. Give a shout out to kindergarten teachers you know. Share your kindergarten memories using #NationalKindergartenDay on Social Media.


National Kindergarten Day honors the day Friedrich Wilhelm August Frobel was born on April 21, 1782. However, we were unable to identify the founder of National Kindergarten Day.  



April 21st honors National Yellow Bat Day. On this day in 1967, the Army activated the 265th Army Security Agency Company (Airborne) with the 101st Airborne Division at Fort Campbell, Kentucky.

The official insignia of the 265th is a bat with outstretched wings on a full moon rising with the motto Through the Night below. Symbolically, the bat represents mystery and secrecy due to its nocturnal nature. The bat fittingly describes the intelligence support provided by the Army Security Agency Battalion.

Before deploying, the personnel painted all the military vehicles and equipment with a yellow bat. The symbol made the equipment clearly visible from a distance and aided in the identification of all unit equipment.

On November 19th of the same year, they deployed to Vietnam with the designation 265th Radio Research Company (Airborne) to provide intelligence support to the 101st Airborne Division. Arriving a few weeks ahead of the Viet Cong Tet Offensive, they soon learned of the North Vietnamese campaign. However, few commanders would believe the intelligence.

Tet Offensive

January 31st on the Vietnamese calendar, Tet, celebrates the lunar new year and is considered a most important holiday. During the conflict between North and South Vietnam, a long-standing informal truce took place every year on Tet.

General Vo Nguyen Giap, commander of the North Vietnamese, prepared to ring in the lunar new year with a series of coordinated attacks, breaking the informal truce.

Doug Bonnot, who was assigned to the 265th RRC (ABN) Operations NCOIC in the spring of 1970 and author of The Sentinel and the Shooter says, “The offensive would come as a surprise to many but personnel of the 265th RRC (ABN) were manning their sector defensive perimeter of Bien Hoa Air Base, along with the very few small units that believed their intelligence reports, some 12 hours before the Tet Offensive was launched.”

The Viet Cong never breached these positions, and the Battle Flag of D: 275th Viet Cong Battalion hangs in the Sentinel Museum today.

D: 275th VC Bn flag which hangs in the Sentinel Museum. The text reads that their mission is to liberate the citizens of Long Binh and Bien Hoa.

D: 275th VC Bn flag which hangs in the Sentinel Museum. The text reads that their mission is to liberate the citizens of Long Binh and Bien Hoa.

The Sentinel Museum is a traveling museum designed to provide insight into the Vietnam conflict. It also increases awareness of the contributions of the 265th Radio Research Company. Since the 265th’s activities were highly classified, the sacrifices of these honorable men remained cloaked in secrecy until decades after the end of the war. Even today, the general public remains unaware of these men who worked in the shadows providing silent and ceaseless support to the infantry soldier during the Vietnam War. The Yellow Bat symbolizes their secrecy and their service, through the night.

HOW TO OBSERVE #NationalYellowBatDay

While the Tet Offensive happened more than 50 years ago, the Yellow Bat’s history lives on. You can continue to learn more about these service members and the 265th Army Security Agency Company (Airborne). You can also recognize this day in several other ways:

  • Take some time to learn more about the Vietnam War and those who served.
  • Read about the Tet Offensive about the 265th.
    • The Sentinel and the Shooter by Douglas W. Bonnot
    • The Tet Offensive 1968 Battle Story by Andrew Rawson
  • Honor those who served during a contentious time in our country
  • Tour the Vietnam Veterans Memorial
  • Volunteer for a veteran’s organization

Be sure to invite family and friends to take the journey with you by using #NationalYellowBatDay to share on social media.


In 2016, Doug Bonnot, President of the Sentinel Chapter of the 101st Airborne Association, submitted National Yellow Bat Day. He and the chapter members all served with the 265th RRC (ABN).

The Registrar at National Day Calendar proclaimed National Yellow Bat Day to be observed on April 21st, annually. For more information on National Yellow Bat Day or the Sentinel Chapter of the 101st Airborne Association, please write to Sentinel Chapter, PO Box 205, Telford, TN 37690

NATIONAL LIBRARY WORKERS DAY – Tuesday of National Library Week.


Each year in April, National Library Workers Day recognizes the valuable contributions library staff make every day to their communities through their hard work and dedication. The observance takes place annually on the Tuesday of National Library Week.  

Libraries do so much more than house the books we borrow nearly any time of the day or night. (Yes, any time, day or night. Online reservation is highly popular.) Today as always, library workers are masters of research. They find the obscure quote (or partial misquote as the case may be) helping you to annotate your research paper correctly. When you’re on a job search, they offer internet access and computers so you can polish up your résumé, too.

Often, libraries are the keepers of local history. The names of pioneers and settlers’ names are usually recorded in books and newspapers of the era. Many libraries across the country house those books, papers, and many other resources. 

Library workers champion our youth. They foster creativity and are a wealth of diverse opportunities for growth. Not only do they create projects and inspiration for our youth, but they also create them with enthusiasm! It can be quite infectious. 

Despite all libraries and their employees provide to their communities, their budgets and salaries continue to shrink. This day brings awareness to this continuing trend. Libraries and their employees continuously utilize the latest technologies to make information, books, and resources more accessible. Their knowledge and ability bring valuable tools directly to communities that might otherwise go without. They also serve every age group, many organizations, and entire communities.

HOW TO OBSERVE #NatonalLibraryWorkersDay

Give a shout out to a library worker you know. Discovery all the resources your library offers. Support your library and its staff. When budget time comes for your city or state, do your part to support your library. Visit your local library, or it’s Use #NationalLibraryWorkersDay to post on social media.


The American Library Association sponsors National Library Workers Day, and it was first celebrated in 2004. It was started as a way to raise support for better benefits and salaries at a time when they had been stagnant for years. The observance continues to promote increased benefits and wages for the services provided by library workers every day.



National Chocolate Covered Cashews Day is observed each year on April 21st. Not unlike other nuts, cashews and chocolate get along well together. Of course, chocolate lovers savor the combination of nutty crunch and creamy, rich chocolate. 

The cashew is a tree from the family Anacardiaceae.  Its English name comes from Portuguese for the fruit of the cashew tree “caju.”  Originally native to Northeastern Brazil, cashew trees are now widely grown in tropical climates for its cashew fruit and nuts.

With leaves arranged spirally and a leathery texture, the evergreen cashew tree grows as tall as 32 feet high. It also often grows with an irregularly shaped trunk. The buds produce small flowers that start out pale green then turn reddish, each one having five slender, acute petals.

Surprisingly, the shell of the cashew nut is toxic, which is why producers shell the cashew before selling it to consumers. While many people enjoy the cashew nut for its delicious buttery flavor on its own, adding chocolate makes it even more enjoyable. It makes a great gift during the winter holidays. However, chocolate-covered cashews are enjoyed all year long. 

HOW TO OBSERVE #ChocolateCoveredCashewsDay

Celebrate with a handful of chocolate-covered cashews. They make terrific party snacks. Add them to trail mix or keep a dish of them by your desk to ward off the mid-day munchies. 

Enjoy this delicious chocolate-covered cashew recipe: Microwave Chocolate Cashew Cluster recipe. Use #ChocolateCoveredCashewsDay to share on social media.


National Day Calendar continues to research the origins of this chocolate and nut holiday.

On Deck for April 22, 2020

National Days

International Days


Recipe of the Day

Cherry Cheese Cake Dip
Prep:  5 minutes
Total Prep:  5 minutes


1 – 8 oz block cream cheese softened
1 – 7 oz jar marshmallow cream
1 – 8 oz tub whipped topping
1 – 21 oz can cherry pie filling
Graham crackers, vanilla wafers, or animal crackers


In a medium bowl, mix cream cheese and marshmallow cream together until well combined.

Add whipped topping and mix until just incorporated.

Pour the mixture into a 9-10 inch pie plate or a serving dish the same diameter.

Spread the cherry pie filling over the cheesecake mixture evenly.

Chill until served.

Dip with animal crackers, graham crackers or vanilla wafers.

About National Day Calendar

National Day Calendar® is the authoritative source for fun, unusual and unique National Days! Since our humble beginnings on National Popcorn Day in 2013, we now track nearly 1,500 National Days, National Weeks and National Months. In addition, our research team continues to uncover the origins of existing National Days as well as discover new, exciting days for everyone to celebrate.

There’s a celebration for everyone. While National Road Trip Day satisfies the itch to wander, many pet days let us share our love of animals. National 3-D Day and National Astronaut Day honor the advancement of technology, too. Every food day you can imagine (National Avocado Day, for example), will keep you celebrating, also!

Be sure to stay in the know by signing up for our e-mail updates. Also, follow us on Facebook, Twitter, and Instagram

Our Ambassador Program is another way #CelebrateEveryDay®! Whether you become an ambassador or follow one of the savvy ambassadors, their fun videos and posts will keep you prepared for every holiday.