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On May 15th, we recognize a morsel of a thing on National Chocolate Chip Day!  

Have you ever wondered how a single ingredient would change a recipe? If it weren’t for one curious baker, it would be hard to imagine where we would be without the invention of chocolate chips.

In 1937, Ruth Graves Wakefield of Whitman Massachusetts must have been curious about what a little bit of chocolate would add to her cookies. While working at the Toll House Inn, she added cut-up chunks of a semi-sweet Nestle chocolate bar to a cookie recipe. The cookies were a huge success and in 1939 Wakefield signed an agreement with Nestle to add her recipe to the chocolate bar’s packaging. In exchange for the recipe, Wakefield received a lifetime supply of chocolateThe Nestle brand Toll House cookies were named for the Inn.

Nestle initially included a small chopping tool with the chocolate bars, too. Starting in 1941, Nestle and other competitors started selling the chocolate in chip or morsel form. For the first time, bakers began making chocolate chip cookies without chopping up the chocolate bar first. 

Chocolate chips originally came in semi-sweet. Later, chocolate producers began offering bittersweet, semi-sweet, mint, white chocolate, dark chocolate, milk chocolate, and white and dark swirled. Today, chips also come in a variety of other flavors that bakers and candy makers use creatively in their kitchens.

While cookies may be the first treat to come to mind, imagination is really the only thing limiting how chocolate chips can be used in baking and candy making. Even savory dishes feature chocolate chips in a variety of ways, too. Had Ruth Graves Wakefield never wondered what a few chopped up chunks of chocolate would be like in her baking, we wouldn’t even have chocolate chip cookies.  

HOW TO OBSERVE #ChocolateChipDay

Whether you bake up chocolate chip cookies or melt them down and begin dipping, be sure to celebrate! Make sweet treats to share or experiment with a new recipe. Dive into Grandma’s recipe box and try an old favorite, too! Be sure to share the bests ones, of course. It’s the best way to #CelebrateEveryDay! Use #ChocolateChipDay to post on social media.


Within our research, National Day Calendar continues seeking the origins of this chocolately holiday. 

ARMED FORCES DAY – Third Saturday in May


Armed Forces Day on the third Saturday in May pays tribute to the military personnel serving in the United States Armed Forces. The celebration takes place each year during Armed Forces Week.

The United States Military is composed of six branches, including the Army, Airforce, Space Force, Navy, Marine Corps, and Coast Guard. As of 2019, more than 1.3 million active-duty service members are stationed in the United States and around the world. An additional 800,000 reservists stand ready in the Army National Guard and the Air National Guard. The holiday unites the country behind the men and women who currently serve in the United States military.

HOW TO OBSERVE #ArmedForcesDay

Volunteer for a veteran organization that supports those who are deployed. Organize care packages for service members or their families. Recognize a service member, you know. Learn more about the history of each branch of the military and how it has evolved. Discover more about your family’s military history, too. Most importantly, show support for those currently serving in the Armed Forces. Call them. Write to them. Send them a message and let them know you support them and respect the choices they’ve made to serve. Use #ArmedForcesDay to post on social media.


It was with the idea for citizens to come together and thank our military members for their patriotic service in support of our country that President Harry S. Truman led the effort to establish this single holiday. The one-day celebration then stemmed from the unification of the Armed Forces under the Department of Defense. On August 31, 1949, Secretary of Defense Louis Johnson announced the creation of an Armed Forces Day to replace separate Army, Navy, Marine Corps, U.S. Coast Guard, and Air Force Days.

The first observance on May 20, 1950, launched with parades, open houses, receptions, and air shows.

  • 1962 – President John F. Kennedy established Armed Forces Day as an official holiday.
  • Bremerton, Washington hosts the United States’ longest-running city-sponsored Armed Forces Day Parade.
  • 2012 – Bremerton celebrated the 64th year of the Parade.

For more information and Poster see:



Every May 15th Peace Officers Memorial Day pays tribute to local, state, and federal law enforcement officers who have made the ultimate sacrifice or been injured in the line of duty. The observance takes place during Police Week.

According to the National Law Enforcement Officers Memorial Fund, more than 800,000 law enforcement officers serve in the United States today. Each year, the National Law Enforcement Officers Memorial adds new names to the wall. The average is 163 deaths per year. Fallen law enforcement officers represent all levels of law enforcement, including local, state, federal, tribal, and military law enforcement. They are family members, husbands, wives, parents, sons, and daughters.

The day honors fallen LEO across the nation and offers support to their surviving family members and officers.

HOW TO OBSERVE #PeaceOfficersMemorialDay

Many organizations, government agencies, and private citizens fly flags at half-staff in memory of those officers who have made the ultimate sacrifice. These organizations conduct services honoring the fallen across the country, including Washington, D.C. Attend a memorial near you. Support families of fallen and injured law enforcement officers.

The National Law Enforcement Officers Memorial wall in Washington, D.C., features the names of more than 22,000 law enforcement officers who have been killed in the line of duty. Use #PeaceOfficersMemorialDay to post on social media.


On October 1, 1961, Congress asked President John F. Kennedy to designate May 15th as a day to honor peace officers. In 1962, President Kennedy issued the declaration for Peace Officers Memorial Day to be observed on May 15th and the week of May 15th to be recognized as National Police Week. In 1994, Bill Clinton made an amendment through Public Law 103-322 that directed the United States flag to be flown at half-staff on May 15th in honor of the day.



Each year on May 15th, we recognize the stylish variety and color available on National Nylon Stocking Day.

Many may not remember ever hearing the term “nylon stockings.” Varying in color, design, and transparency, a nylon stocking (also known as hose) is a close-fitting, variously elastic garment worn the same as socks or tights.

Stockings worn before the 1890s were made of woven cloth such as cotton, linen, wool, or silk. Before the 1920s, women’s stockings were worn for warmth.  As hemlines of women’s dresses rose in the 1920s, women began to wear stockings over their exposed legs. These 1920s stockings were sheer, made first of silk or rayon, followed by nylon after 1940.

Chemical company DuPont’s introduction of nylon in 1939 began a high demand for stockings in the United States.  As nylon stockings were inexpensive, durable, and shear, up to 4 million pairs would be purchased each day.

World War II and Beyond

On February 11, 1942, as America entered World War II, DuPont ceased production of nylon stockings and switching its focus to the manufacture of parachutes, airplane cords, and rope.  This created a mass shortage followed by a black market for stockings.  At the end of World War II, DuPont resumed production of the stockings but could not meet the demand leading to nylon riots in American stores. In time, DuPont was able to increase its output.

In the 1940s and 1950s, the first pantyhose made its appearance.  Film and theater productions had stockings sewn to the briefs of actresses and dancers, as seen in popular films such as Daddy Long Legs. Unlike stockings, pantyhose did not require a garter belt to hold the stockings up.

Pantyhose were introduced in 1959, providing a convenient alternative to stockings which led to a decline in their sales. In 1970, for the first time, United States sales of pantyhose exceeded stocking sales and have remained the same ever since. In 1987, there was a slight decline in sales in pantyhose due to the newly invented hold-ups. However, they remain the most purchased kind of hosiery.

HOW TO OBSERVE #NylonStockingDay

Today nylons come in every color and a variety of styles. Show off your fashion sense with the latest styles. Share using #NylonStockingDay to post on social media.


Within our research, we were unable to find the origin of National Stocking Day.

NATIONAL LEARN TO SWIM DAY – Third Saturday in May


National Learn to Swim Day on the third Saturday in May is dedicated to educating parents and children about water safety. Before Memorial Day Weekend and the start of summer, it is an annual opportunity for families to learn the importance and benefits of learning to swim.

There are remarkable benefits to learning to swim. Besides the obvious safety benefit, other benefits include:

  • We gain additional fitness opportunities when we learn to swim. No matter our age, learning to swim is an excellent cardiovascular exercise that is easy on the joints. It is also a lifelong skill that many of us will appreciate as we age.
  • As we learn to swim, we also gain social skills. Swimming is a social activity. It’s one that offers us opportunities to meet new people who often teach us new things.
  • It’s a year-round exercise. Most fitness centers have pools and when the winters get long, what better way to burn off some energy than to take the kids to the pool.
  • The younger we start, the more benefits we receive. From motor skills to stress relief to safety skills, swimming has it.
  • When it comes to children with disabilities, swimming is easily accessible and adaptable.

While swimming is enjoyed by all ages all year round, summer is a time when we take to the lakes, rivers, and outdoor pools. Because of the risks involved when one is in the water, safety, and knowledge, from the earliest age, are vital.


Sign up for swimming lessons. No matter your age, it’s time to take a dip. Use #LearnToSwimDay to post on social media.


Swimways Corp founded National Learn to Swim Day in 2014. “Swimways Corp. is a leader in the recreational water products marketplace and creator of the SwimWays(R) Swim Steps(TM) program that helps kids learn to swim.”

On Deck for May 16, 2021

National Days

International Days

May 15th Celebrated (and Not So Celebrated) History

Dr. Joseph Lawrence and Jordan Lambert register the disinfectant called Listerine. Inspiration for the name came from the English surgeon Joseph Lister who touted the importance of antiseptic protocols including handwashing before surgery.


President Franklin D. Roosevelt signs legislation creating the Women’s Auxiliary Army Corps. Oveta Culp Hobby was named as the organization’s first director. The name would later be shortened to Women’s Army Corps. In early 1941, Congresswoman Edith Nourse Rogers of Massachusetts sponsored the original bill creating the WAAC so that women volunteers would have support and benefits for their service. While the bill didn’t initially obtain support, after the bombing of Pearl Harbor, Congress reconsidered. The organization was created as a joint operation of the Army.


Astronaut Gordon Cooper becomes the first American to spend more than a single day in space. During the final mission of Project Mercury, Cooper completed 22 orbits of the Earth and his entire flight spanned 34 hours, 19 minutes, 49 seconds.

Recipe of the Day

Cherry Cheesecake 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.

May 15th Celebrated (and Not So Celebrated) Birthdays
L. Frank Baum – 1856

The American writer is the author of a series of children’s books featuring a place called Oz. The 1939 film The Wizard of Oz was based on Baum’s The Wonderful Wizard of Oz. It starred Judy Garland, Ray Bolger, Bert Lahr, Jack Haley, Margaret Hamilton, and Frank Morgan.

Williamina P. Fleming – 1857

The American astronomer is best known for discovering the Horsehead Nebula in the constellation Orion.

Horsehead Nebula

Pierre Curie – 1859

In 1903, the French physicist, along with French physicists Marie Curie and Henri Becquerel received the Nobel Prize in Physics “in recognition of the extraordinary services he has rendered by his discovery of spontaneous radioactivity.”

Hickory Starr – 1915

A descendent of Sequoyah, Hickory Starr served as the Chief of the Nighthawk Keetoowah Society founded by his grandfather, Redbird Smith.

Madeleine Albright – 1937

In 1997, Madeleine Albright became the first woman to serve as United States Secretary of State. President Bill Clinton named Albright to the position, and she served until 2001.

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.

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