Where the World Gathers to Celebrate Every Day




National Administrative Professionals’ Day, also known as Secretaries Day or Admin Day, recognizes the professionals who keep an office running smoothly every day. Celebrate these professionals on the Wednesday of the last full week in April of each year. The day recognizes the work of secretaries, administrative assistants, receptionists, and other administrative support professionals. Central to any business, these professionals keep an office organized and efficient. 

The day in the life of an administrative professional is varied from moment to moment. While organization is key to their success, their flexibility and ability to handle the unexpected make them valuable to any business. Some of their responsibilities include managing appointments, drafting letters and memos, booking business trips, coordinating appointments and planning meetings. 

Administrative professionals compile data and research information, too. Their organizational skills mean they pinpoint information quickly and keep the executive on schedule, whether they are in transit or with a client. They are central to an office or business running efficiently. 

HOW TO OBSERVE #AdminProfessionalsDay

Celebrate by giving gifts to your assistant, such as flowers, gift certificates, gift baskets, candy or lunch. Honor your assistant by sharing your gratitude on social media using #AdminProfessionalsDay.


The International Association of Administrative Professionals promotes National Administrative Professionals Day. The observance first launched in 1952 when U.S. Secretary of Commerce, Charles Sawyer proclaimed June as National Secretaries Week. In that same year, June 4th was designated National Secretaries Day. The name changed to Administrative Professionals in 2000 when the day was also added and the events moved to April.



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. It allowed them to smoothly transition from home to school.

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. However, it wasn’t until 1873 that it became part of any public school system.

HOW TO OBSERVE #NationalKindergartenDay

National Kindergarten Day offers an opportunity to thank a kindergarten teacher you know. There are several ways to celebrate the day, too!

  • Recognize an outstanding kindergarten teacher.  
  • Explore a career in elementary education, specifically as a kindergarten teacher.
  • Learn more about elementary education.
  • Donate to a teacher’s supply fund.
  • Share your experiences as a kindergarten teacher.
  • Invite families to see how today’s students learn.
  • Spend a day in a classroom.

You can also visit the National Day Calendar Classroom for projects and ideas to help you Celebrate Every Day. 

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 identifying 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.

As a mobile museum, The Sentinel Museum provides 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, these honorable men’s sacrifices 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 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 their cashew fruit and nuts.

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

Surprisingly, the cashew nutshell is toxic, so 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, people enjoy chocolate-covered cashews 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. Share your favorite recipes and bring the finished product to share. We even have a recipe for you to try. 

Microwave Chocolate Cashew Cluster

Use #ChocolateCoveredCashewsDay to share on social media.


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

April 21st Celebrated (and Not So Celebrated) History


President John F. Kennedy opens the Seattle World’s Fair via remote control from Palm Beach, Florida. The central feature of the fair was the 600 foot tall Space Needle. It included a revolving dining room and 360 degree viewing.


Based on the comic strip “Little Orphan Annie” by Harold Gray, Annie debuts on Broadway. Peter Howard directs the award-winning musical. It won seven Tony Awards including Best Musical and Best Original Score.

Recipe of the Day

New York Cheesecake
Prep:  25 minutes
Cook:  45 minutes
Total Prep:  70 minutes
Servings:  6-8

New York Cheesecake


1 – 1/2 cups graham cracker crumbs
6 tablespoons melted butter
1/4 cup powdered sugar

8 ounces cream cheese
2 large eggs
3/4 cup sugar
2 tablespoons cornstarch
1 cup sour cream

1 cup sour cream
3/4 cup sugar


First Prepare Crust:

Mix graham cracker crumbs, butter, and 1/4 cup powdered sugar.

Press into a well greased, 9-inch springform pan.

Spread up the side and along the bottom of the pan.

Place in freezer and chill for 5 to 10 minutes.

Next prepare filling:

Heat oven to 400°.

In a medium bowl, mix cream cheese and 3/4 cup sugar until smooth.

Add eggs, vanilla, and cornstarch and mix well.

Stir in  1 cup sour cream.

Pour the mixture into the cooled crust and bake for 45 minutes.

Turn off the oven and let cool 3 hours with the door slightly ajar.

Refrigerate overnight.

Prepare topping (before serving):

Combine 1 cup sour cream and 3/4 cup sugar.

Pour over chilled cheesecake before serving.

April 21st Celebrated (and Not So Celebrated) Birthday

Friedrich Wilhelm August Frobel – 1782

The German student of Johann Pestalozzi is credited with laying the foundation for the modern kindergarten in Blankenburg, German.

Charlotte Bronte – 1816

In 1847, the English novelist published her most notable work, Jane Eyre.

John Muir – 1838

The naturalist and preservationist is best known for co-founding the Sierra Club. Through his efforts, natural treasures such as Yosemite, Sequoia, the Grand Canyon, and Mt. Rainier are protected as national parks.

Dorothy Baker – 1907

Author Dorothy Baker wrote three novels in her lifetime earning her a Houghton Mifflin Literary Fellowship and a Guggenheim Fellowship.

Queen Elizabeth II

On February 6, 1952, Elizabeth II succeeded her father King George VI following his death. She has four children; Charles, Prince of Wales, Anne, Princess Royal, Prince Andrew, Duke of York, and Prince Edward, Earl of Wessex.

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.